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United States Patent5973681
Tanigawa , ; et al.October 26, 1999
Title
Interactive data communication system with unidirectionally transmitted broadcast wave
Abstract
A transmitting apparatus for an interactive communication system using a broadcast wave, which includes a first storage unit, a second storage unit, and a transmitting unit. The first storage unit stores a plurality of frames of image data. The second storage unit stores control information which shows links between said plurality of frames of image data stored in the first storage unit, and which indicates a combining of a supplementary design with the image data. These supplementary designs are stored by a receiving apparatus and are combined with the image represented by the image data. The transmitting unit repeatedly transmits a predetermined number of frames of image data together with corresponding control information.
Inventors:Tanigawa; Hidekazu (Hirakata, JP), Okamura; Kazuo  (Hirakata, JP), Hirai; Junichi  (Suita, JP), Miyabe; Yoshiyuki  (Osaka, JP)
Assignee:Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Appl. No.:867344
Filed:June 2, 1997
Foreign Application Priority Data
May 31, 1996 [JP] 8-138500
Current U.S. Class:715/716 725/131 725/37 348/473 348/564 
Field of Search:345/327 348/6,10,12,13,906,469,473,476-479,553,556,564,565,566 455/3.1,4.1,4.2,6.1,6.2,6.3
U.S. Patent Documents
4797942January 1989Burt
5327554July 1994Palazzi, III et al.
5355480October 1994Smith et al.
5473609December 1995Chaney
5515106May 1996Chaney et al.
5539479July 1996Bertram
5539822July 1996Lett
5539920July 1996Menand et al.
5650826July 1997Eitz
5819034October 1998Joseph et al.
Foreign Patent Documents
WO 92 14341Aug., 1992WO
Primary Examiner: Miller; John W.
Attorney, Agent or Firm:Price Gess & Ubell
Claims

What is claimed is:
1. A communication system, including a transmitting apparatus and a receiving apparatus, for achieving interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, storing means for storing a background image that is main image data to be displayed by the receiving apparatus and position information that indicates a position within the background image; and
transmitting means for reading the supplementary designs, the background image, and the position information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read background image, and the read position information,
the receiving apparatus comprising:
separating means for separating the supplementary designs, the background image, and the position information from the repeatedly transmitted multiplexed supplementary designs, background image, and position information;
combining means for combining the separated background image and at least one separated supplementary design at a position indicated by the separated position information to generate image data; and
reproducing means for reproducing the generated image data and outputting an image signal.

2. A communication system, including a transmitting apparatus and a receiving apparatus, for achieving interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, first storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background images, and the plurality of sets of control information,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data; second storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and
control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the second storing means.

3. A communication system, including a transmitting apparatus and a receiving apparatus, for achieving interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs including at least one cursor image;
first storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the plurality of background images, and the plurality of sets of control information,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information; combining means for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in
the separated set of control information, to generate image data;
second storing means for storing the generated image data and the separated set of control information; reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the second storing means.

4. A communication system, including a transmitting apparatus and a receiving apparatus, for achieving interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being two types of cursor images that respectively represent a selected and a non selected state;
first storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background images, and the read plurality of sets of control information,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
second storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and
control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the second storing means.

5. A communication system, including a transmitting apparatus and a receiving apparatus, for achieving interactivity using a broadcast wave,
the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand;
first storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a it background image; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background images, and the read plurality of sets of control information,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining, based on the supplementary design combining information included in the separated set of control information, at least one separated supplementary design with the separated background image at a position indicated by the supplementary combining information to generate image data;
second storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the second storing means.

6. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus, and transmitting means for reading the supplementary designs and repeatedly transmitting the supplementary designs; and
storing means for storing a background image that is main image data to be displayed by the receiving apparatus, the transmitting means reading the background image from the storing means, multiplexing the read supplementary designs and background image, and repeatedly transmitting the multiplexed background image and supplementary designs;
obtaining means for obtaining page information from the World Wide Web on the Internet, the page information representing a page that is an arrangement of characters and images and including character information, image information, and link information showing a link to another page; and
generating means for generating a background image that corresponds to a frame including characters and images, based on the character information and images information in the obtained page information.

7. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus, and transmitting means for reading the supplementary designs and repeatedly transmitting the supplementary designs wherein the supplementary designs are figures that give a bold display of headings; and
storing means for storing a background image that is main image data to be displayed by the receiving apparatus, the transmitting means reading the background image from the storing means, multiplexing the read supplementary designs and background image, and repeatedly transmitting the multiplexed background image and supplementary designs.

8. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus, and transmitting means for reading the supplementary designs and repeatedly transmitting the supplementary designs; and
storing means for storing a background image that is main image data to be displayed by the receiving apparatus, the transmitting means reading the background image from the storing means, multiplexing the read supplementary designs and background image, and repeatedly transmitting the multiplexed background image and supplementary designs, wherein the storage means further stores region information, the region information indicating a region in the background image, the supplementary designs being combined with the region in the background image, the transmitting means reading the region information, multiplexing the read region information with the read supplementary designs and read background information, and repeatedly transmitting a result of the multiplexing.

9. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus, and transmitting means for reading the supplementary designs and repeatedly transmitting the supplementary designs; and
storing means for storing a background image that is main image data to be displayed by the receiving apparatus, the transmitting means reading the background image from the storing means, multiplexing the read supplementary designs and background image, and repeatedly transmitting the multiplexed background image and supplementary designs, wherein the storage means further stores a classification for a specific part of an image, the classification corresponding to a specific supplementary design, the transmitting means reading the classification, multiplexing the read classification with the read supplementary designs and read background information, and repeatedly transmitting a result of the multiplexing.

10. The transmitting apparatus of claim 9, wherein the classification for a specific part of an image is for one of a character and image that is linked to another background image.

11. The transmitting apparatus of claim 9, wherein the classification for a specific part of an image is for a heading.

12. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand;
storing means for storing a background image that is main image data to be displayed by a receiving apparatus and position information that shows a position within the background image, the receiving apparatus combining at least one supplementary design with the background image at the position indicated by the position information; and
transmitting means for reading the supplementary designs, the position information, and the background image, and for multiplexing and repeatedly transmitting the read supplementary designs, position information, and background image.

13. The transmitting apparatus of claim 12, wherein the position information includes an X coordinate and a Y coordinate that indicate the position in the background image, the receiving apparatus combining at least one supplementary design with the background image at the position indicated by the X coordinate and the Y coordinate in the position information.

14. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus;
storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background;
the background image, the receiving apparatus combining at least one supplementary design with the background image at the position indicated by the X coordinate and the Y coordinate in the position information.

15. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus;
storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background.

16. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus and the supplementary designs being two types of cursor images that respectively represent a selected and a non-selected state;
storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image; and transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background images, and the plurality of sets of control information.

17. A transmitting apparatus for use in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising:
supplementary design storing means for storing supplementary designs beforehand, the supplementary designs being combined with main image data and displayed by a receiving apparatus;
storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image and including position information that indicates a position in a background image, the receiving apparatus combining at least one supplementary design at the position in the background image indicated by the position information; and
transmitting means for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background images, and the plurality of sets of control information.

18. A receiving apparatus for use in a communication system that achieves interactivity using a broadcast wave, wherein supplementary designs are repeatedly transmitted, the supplementary designs being combined with main image data and displayed by the receiving apparatus, the receiving apparatus comprising:
separating means for separating at least one supplementary design from repeatedly transmitted supplementary designs;
supplementary design storing means for storing the separated supplementary designs;
supplementary design reading means for reading a supplementary design from the supplementary design storing means;
combining means for combining the read supplementary design with the separated background image and generating image data; and
reproduction means for reproducing the generated image data and outputting an image signal;
wherein the supplementary designs are repeatedly transmitted having been multiplexed with a background image, the background image being main image data to be displayed by the receiving apparatus, the separating means separating the supplementary designs and the background image from the repeatedly transmitted multiplexed supplementary designs and background image; and
wherein the supplementary designs are repeatedly transmitted having been multiplexed with a background image and a classification of a specific image part, the classification corresponding to a specific supplementary design, the separating means separating the supplementary designs, the background image, and the classification from the repeatedly transmitted multiplexed supplementary designs, background image, and classification, and the supplementary design reading means reading a supplementary design that corresponds to the separated classification.

19. The receiving apparatus of claim 18, wherein the classification for a specific part of an image is for one of a character and image that is linked to another background image.

20. The receiving apparatus of claim 18, wherein the classification for a specific part of an image is for a heading.

21. A receiving apparatus for use in a communication system that achieves interactivity using a broadcast wave, wherein supplementary designs, a background image, and position information are multiplexed and repeatedly transmitted, the background image being main image data to be displayed by the receiving apparatus and the position information indicating a position in the background image, the receiving apparatus comprising:
separating means for separating the supplementary designs, the background image, and the position information from the repeatedly transmitted multiplexed supplementary designs, background image, and position information;
combining means for combining the separated background image and at least one separated supplementary design at the position indicated by the separated position information to generate image data; and
reproducing means for reproducing the generated image data and outputting an image signal.

22. The receiving apparatus of claim 21, wherein the position information includes an X coordinate and a Y coordinate that indicate the position in the background image, the combining means combining at least one supplementary design with the background image at the position indicated by the X coordinate and the Y coordinate in the position information.

23. A receiving apparatus for use in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and
control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing means.

24. A receiving apparatus for use in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted, the plurality of supplementary designs including at least one cursor image, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing means.

25. A receiving apparatus for use in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted, the supplementary designs being two types of cursor images that respectively represent a selected and a non-selected state, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image, the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and
control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing means.

26. A receiving apparatus for use in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image and including position information that indicates a position in a background image,
the receiving apparatus comprising:
separating means for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
combining means for combining, based on the supplementary design combining information included in the separated set of control information, the separated background image and at least one separated supplementary design at the position in the background image indicated by the position information included in the supplementary design combining information, to generate image data;
storing means for storing the generated image data and the separated set of control information;
reproducing means for reproducing the generated image data and outputting an image signal;
operation means for receiving a user operation that indicates a switching of image data; and
control means for controlling the separating means, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing means.

27. A transmitting method for use by a transmitting apparatus in a communication system that achieves interactivity using a broadcast wave, the transmitting apparatus comprising;
supplementary design storing means for storing supplementary designs beforehand; and
storing means for storing a plurality of background images that are main image data to be displayed by the receiving apparatus and a plurality of sets of control information, each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image,
the transmitting method comprising:
a transmitting step for reading the plurality of supplementary designs, the plurality of background images, and the plurality of sets of control information, and for multiplexing and repeatedly transmitting the read supplementary designs, the read plurality of background images, and the plurality of sets of control information.

28. A computer readable recording medium recording a receiving program for use by a receiving apparatus in a communication system that achieves interactivity using a broadcast wave, wherein supplementary designs, a background image, and position information are multiplexed and repeatedly transmitted, the background image being main image data to be displayed by the receiving apparatus and the position information indicating a position in the background image, the receiving program comprising: a separating step for separating the supplementary designs, the background image, and the position information from the repeatedly transmitted multiplexed supplementary designs, background image, and position information;
a combining step for combining the separated background image and at least one separated supplementary design at the position indicated by the separated position information to generate image data; and a reproducing step for reproducing the generated image data and outputting an image signal.

29. A computer readable recording medium recording a receiving program for use by a receiving apparatus in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted to the receiving apparatus, each background image being main image data to be reproduced by the receiving apparatus, each set of control information including image link information and supplementary design combining information indicating a combining of at least one supplementary design with a background image,
the receiving program comprising:
a separated step for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
a combining step for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
a storing step for storing the generated image data and the separated set of control information;
a reproducing step for reproducing the generated image data and outputting an image signal;
an operation step for receiving a user operation that indicates a switching of image data; and
a control step for controlling the separating step, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing step.

30. A computer readable recording medium recording a receiving program for use by a receiving apparatus in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted to the receiving apparatus, the plurality of supplementary designs including at least one cursor image, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image,
the receiving program comprising:
a separating step for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
a combining step for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
a storing step for storing the generated image data and the separated set of control information;
a reproducing step for reproducing the generated image data and outputting an image signal;
an operation step for receiving a user operation that indicates a switching of image data; and
a control step for controlling the separating step, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing step.

31. A computer readable recording medium recording a receiving program for use by a receiving apparatus in a communication system that achieves interactivity using a broadcast wave, wherein a plurality of supplementary designs, a plurality of background images, wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted to the receiving apparatus, the supplementary designs being two types of cursor images that respectively represent a selected and a non-selected state, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image, the receiving program comprising: a separating step for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
a combining step for combining the separated background image and at least one separated supplementary design, based on the supplementary design combining information included in the separated set of control information, to generate image data;
a storing step for storing the generated image data and the separated set of control information;
a reproducing step for reproducing the generated image data and outputting an image signal;
an operation step for receiving a user operation that indicates a switching of image data; and
a control step for controlling the separating step, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing step.

32. A computer readable recording medium recording a receiving program for use by a receiving apparatus in a communication system that achieves interactivity using a broadcast wave,
wherein a plurality of supplementary designs, a plurality of background images, and a plurality of sets of control information are multiplexed and repeatedly transmitted, each background image being main image data to be reproduced by the receiving apparatus, each set of control information corresponding to a different one of the background images and each set of control information including image link information and supplementary design combining information, the image link information showing a link from one background image to another background image, and the supplementary design combining information indicating a combining of at least one supplementary design with a background image and including position information that indicates a position in a background image, the receiving program comprising: a separating step for separating the supplementary designs, one background image, and the set of control information corresponding to the one background image from the repeatedly transmitted multiplexed supplementary designs, background images, and sets of control information;
a combining step for combining, based on the supplementary design combining information included in the separated set off control information, the separated background image and at least one separated supplementary design at the position in the background image indicated by the position information included in the supplementary design combining information, to generate image data;
a storing step for storing the generated image data and the separated set of control information;
a reproducing step for reproducing the generated image data and outputting an image signal;
an operation step for receiving a user operation that indicates a switching of image data; and
a control step for controlling the separating step, in response to a user operation, to separate a background image that is indicated by the image link information included in the set of control information stored by the storing step.
Description
BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to a data communication system, and to a data transmitting apparatus and data receiving apparatus, where simulated bidirectional communication processing is performed between a data transmitting apparatus and a data receiving apparatus using one-way communication, such as a television (TV) broadcast.

(2) Description of the Prior Art

It is now possible to connect personal computers in the home to networks using a standard telephone line and so receive a great variety of information provided by servers around the world. The most representative example of such a network is the World Wide Web (WWW) on the Internet. WWW servers transmit a combination of image information and control information, which has the image information displayed within text information, to personal computers as the data for displaying a one-page image on the personal computer's screen. When such pages are made up of text information alone, only control information for displaying this text information is transmitted. This control information is written using HTML (HyperText Markup Language), with browser software executed by the personal computer decoding and executing the HTML code to display each page on the WWW which is downloaded by the user. Here, information indicating a link to another page can be attached to character strings and images in a page, so that when the user makes a selection operation for such a character string or image using a mouse, for example, the browser will access the WWW server that provides the indicated page and will obtain the information for displaying this new page. On obtaining this information, the browser will decode and execute its content to display the new page.

Japanese Laid-Open Patent Application 7-322226 (1995) discloses a method for multiplexing control information that can generate the kind of interactive display described above into a TV broadcast which is transmitted using a TV broadcast ground wave. In this method, the program transmitting apparatus multiplexes data, written in a language which resembles HTML for composing an interactive screen, into a program broadcast before transmitting. On receiving this broadcast, the program receiving apparatus interprets the composition of the interactive screen and combines basic display elements which have been stored inside its construction in accordance with the indicated composition to display the interactive screen.

The above method has a major drawback in that the control information is written in a language for indicating a variety of control operations which are performed for display, so that the receiving apparatus needs to interpret and execute these control operations one by one to perform display. Additionally, most high resolution images provided by WWW servers are compressed using complex techniques, so that when a receiving apparatus attempts to display such image information, it is usually necessary to perform decompression in addition to the processes for display in accordance with the control information. Since such complex processing is required, the load of the receiving apparatus is considerable, which greatly increases the cost of the necessary hardware for the receiving apparatus. This problem makes this communication method unsuitable for a TV broadcast communication system in which transmission is performed from a small number of transmitting apparatuses to a large number of receiving apparatuses.

SUMMARY OF THE INVENTION

In view of the above problems, it is a first object of the present invention to provide a transmitting apparatus, a receiving apparatus, a reception method, a medium storing a reception program, and a communication system where interactivity is achieved by simulated bidirectional communication between a data transmitting apparatus and a data receiving apparatus in a one-way communication system such as a TV broadcast system, without increasing the load of the data receiving apparatus.

A second object of the present invention is to have an image which emphasizes a specific part or the display image displayed by the receiving apparatus in addition to supplementary designs for a variety of buttons which make operations clearer and easier to understand for the user. Here, the user is able to customize these supplementary designs, the designs having a further benefit of reducing the amount of data transmitted to the receiving apparatus.

These objects can be achieved by a transmitting apparatus for an interactive communication system using a broadcast wave, including: a first storage unit for storing a plurality of frames of image data; a second storage unit for storing control information which shows links between the plurality of frames of image data stored in the first storage unit, and which indicates a combining of a supplementary design with the image data stored in the first storage unit, the supplementary design being stored by a receiving apparatus and being combined with an image represented by the image data: and a transmitting unit for repeatedly transmitting a predetermined number of frames of image data together with corresponding control information.

With the above construction, image data, control information corresponding to the image data, and information indicating the combining or the image data with supplementary designs are repeatedly transmitted. The receiving apparatus will definitely receive the information indicating the combining or supplementary designs and the linked image data indicated by the control information the next time such data is transmitted in the transmission cycle, so that interactive jumps to a user's desired image data can be performed one after the other. As a result, broadcast signals which are limited to communication in one direction can be used to achieve an interactiveness which for the user will resemble bidirectional communication. Also, having the receiving apparatus combine supplementary designs with the image data makes the system very easy to operate.

Here, the transmitting apparatus may include an obtaining unit for obtaining pieces of page information representing a page containing characters and images, the page information including link information to show a link is to another page, character information, and image information; a first producing unit for producing one frame of image data containing characters and images in accordance with the character information and image information included in a piece of page information; and a second producing unit for interpreting the link information included in the obtained page information and producing, for each frame of image data, control information including image link information about a link to another frame of image data and supplementary design combining information indicating a combining of a supplementary design with the frame of image data generated by the first producing unit, the supplementary design being stored by a receiving apparatus and being combined with an image represented by the image data.

With the above construction, page information received from an external source can be converted into image data, control information, and supplementary design information which indicates a combining of supplementary designs for each set of image data, these sets of data being suited to broadcasting

Here, the obtaining unit may obtain the page information from the World Wide Web on the Internet.

With the above construction, the transmitting apparatus can convert HTML documents on WWW servers on the Internet into image data, control information, and supplementary design information which it then broadcasts. As a result, the transmitting apparatus can provide users with an interactive program which resembles "net surfing" on the Internet using only a TV broadcast wave.

Here, the determining unit may determine a headline as the specified image part, and the generating unit may generate supplementary design combining information which indicates a combining of the specific image part with a supplementary design for bold display.

With the above construction, the transmitting apparatus can detect the headline written in an HTML document on a WWW server on the Internet and can generate supplementary design combining information indicating a combining of the supplementary design at an image position of the headline. The receiving apparatus receives this supplementary design combining information and combines a supplementary design, which is made up of a frame which surrounds the title of the image data, with the image data to emphasize the title of the image data.

Here, the determining unit may determine one of a character and an image to which a link has been attached as the specific image part, and the generating unit may generate supplementary design combining information indicating a combining of supplementary design, which shows that a link to another frame of image data is attached, with the specified image part.

With the above construction, the transmitting apparatus can determine the characters and images in a HTML page which have a link to another image attached to them and can generate supplementary design combining information indicating a combining of these characters and images with a supplementary design. The receiving apparatus receives this supplementary design combining information and superimposes a supplementary design showing the attachment of a link to another image at a position in the image data of such linked character or image to emphasize the characters and images to which links to other image data have been attached.

Here, the second producing unit may include: a supplementary design storage unit for storing a supplementary design beforehand; and a supplementary design adding unit for reading a supplementary design from the supplementary design storage unit and for adding the read supplementary design to the stored control information.

With the above construction, the transmitting apparatus adds supplementary designs, which it already stores, to the control information, so that a receiving apparatus can receive this control information including supplementary designs from the transmitting apparatus, and can obtain the supplementary designs from the control information which it then stores. The receiving apparatus can then combine these received supplementary designs with image data, meaning that a variety of supplementary designs may be used by the receiving apparatus.

The objects of the present invention can also be achieved by a receiving apparatus for an interactive communication system using a broadcast wave, wherein the broadcast wave is produced by multiplexing a plurality of frames of image data, and control information which includes image link information for each frame of image data showing links with other frames or image data and supplementary design combining information indicating the combining of a supplementary design with the plurality of frames of image data, the broadcast wave being repeatedly transmitted, and the supplementary design being combined with an image of the image data, wherein the receiving apparatus includes: a separating unit for separating a frame of image data and corresponding control information from the broadcast wave; a supplementary design storage unit for storing at least one supplementary design; a supplementary design reading unit for reading a supplementary design from the supplementary design storage unit, based on the separated control information; a combining unit for combining the read supplementary design with the separated image data; a storage unit for storing the combined image data and separated control information; a reproducing unit for reproducing the stored image data to output an image signal; an operation unit for receiving an operation instruction from a user to switch image data; and a control unit for controlling the separating unit to separate another frame of image data designated by the control information stored in the storage unit according to the operation instruction.

With the above construction, the receiving apparatus receives the broadcast wave from the transmitting apparatus and separates one set of image data, reproduces it, and outputs it as an image signal in accordance with user operations to achieve a simulated interactive environment. The receiver apparatus will definitely receive the image data indicated by control information and the control information for combining the image data with supplementary designs the next time this information is broadcast in the repeated transmission, so that the user can interactively select the linked image data which is to be displayed next. As a result, what appears to the user as interactive display using bidirectional communication can be achieved using a TV broadcast wave which only allows communication in one direction. Also, while servers in a bidirectional communication system have a load which changes depending on the number of requests from receiving apparatuses, meaning that the response time taken for the switching of the display image by a receiver apparatus can greatly vary, in the present invention the transmitting apparatus has no ouch changing load and so has at fixed cycle for repeatedly broadcasting all of the image data. As a result, the receiving apparatus will always be able to switch the image data within a fixed response time, which at most will be the time taken by one transmission cycle. The control information received by the receiving apparatus includes information indicating a combining of a supplementary design with the image data, so that the supplementary design can be superimposed onto the image data to assist the user in making his/her operations.

Here, the classification may indicate a headline as the specific image part and the supplementary design specifying unit may specify a supplementary design which emphasizes the specific image part.

With the above construction, the receiving apparatus receives the supplementary design combining information, and combines the supplementary design, which is a frame which surrounds the title of the display image, with the image data to emphasize the title.

Here, the classification may indicate one of a character and image to which a link has been attached as the specific image part and the supplementary design specifying unit may specify a supplementary design which shows that the specific image part has an attached link to other image data.

With the above construction, the transmitting apparatus receives supplementary design combining information and combines the supplementary designs showing links to other image data at the positions of characters or images which are linked to other sets of image data, so that the characters or images which are linked to other sets of image data are emphasized in the display.

Here, the supplementary designs stored in the supplementary design storage unit which are used for showing that a link to other image data is attached may be composed of two types which respectively correspond to a selection and a non-selection state, the operation unit may receive a selection operation from the user for one of a character and an image to which a link is attached, the receiving apparatus may include a state storage unit for storing a selection or non-selection state in accordance with an instruction from the operation unit, and the supplementary design reading unit may read a supplementary design corresponding to a state stored in the state storage unit from the supplementary design storage unit.

With the above construction, the supplementary designs are of two types which respectively show a selection and a non-selection state, so that the receiving apparatus can change the supplementary designs to be combined with the image data depending on whether the corresponding item is selected or not by the user. This clarification of the display assists the user in making his/her operations.

Here, the control information received from a transmitting apparatus may further include a supplementary design, and the receiving apparatus may further comprise a supplementary design recording unit for recording a supplementary design included in the separated control information in the supplementary design storage unit.

With the above construction, the receiving apparatus receives control information including supplementary designs from the transmitting apparatus, obtains the supplementary designs from the control information, and stores them. The receiving apparatus then uses the stored supplementary designs when combining supplementary designs with the image data, so that a variety of supplementary designs can be used by the receiving apparatus.

Here, the supplementary design storage unit may include a plurality of supplementary designs, the receiving apparatus may further include a supplementary design selecting unit for selecting one supplementary design from the plurality of supplementary designs stored by the supplementary design storage unit, in accordance with a user operation, and the supplementary design reading unit may read the selected supplementary design.

With the above construction, the user can select his/her desired supplementary designs.

The above objects can also be achieved by a receiving method used in a receiving apparatus for an interactive communication system using a broadcast wave produced by multiplexing a plurality of frames of image data and control information including link information showing a link to another of the plurality of frames of image data and supplementary design combining information for each frame of image data indicating a combining of a supplementary design and the image data, the supplementary design being combined with an image represented by the image data, the receiving method including: a separating step for separating a frame of image data and corresponding control information from the broadcast wave; a supplementary design reading step for reading a supplementary design stored in a memory; a combining step for combining the read supplementary design and the image data; a storage step for storing the combined image data and the separated control information in a memory; a reproducing step for reproducing the image data stored in the memory to output an image signal; a operation step for receiving a user operation instruction to switch image data; a determining step for determining image data indicated by the control information stored in a memory according to the operation instruction; and a second separating step for separating the determined image data and corresponding control information from the broadcast wave.

The above object can also be achieved by a communication system which includes the transmitting apparatus and receiving apparatus described above.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects, advantages and features of the invention will become apparent from the following description thereof taken in conjunction with the accompanying drawings which illustrate a specific embodiment of the invention. In the drawings:

FIG. 1 is a block diagram showing the structure of the data communication system 100 of the first embodiment of the present invention,

FIG. 2 shows an example file list 200 stored in the file list storing unit 121;

FIG. 3 shows the HTML document 301 "Report.html" which is the first page of a home page provided by a WWW server;

FIG. 4 shows the image information 401 "Weather.gif" which is an image displayed on the first page of the home page;

FIG. 5 shows the HTML document 501 "Tokyo.html" which is the second page of the home page;

FIG. 6 shows the HTML document 601 "Osaka.html" which is the third page of the home page;

FIG. 7 shows an example of the link information table 700 stored in the data conversion table storing unit 122;

FIGS. 8A to 8C show transmission data 800 for the first page of the WWW home page generated from the HTML document 301, audio information "Weather.au", and the image information 401;

FIGS. 9A and 9B show transmission data 900 for the second page of the WWW home page generated from the HTML document 501;

FIGS. 10A and 10B show transmission data 1000 for the third page of the WWW document generated from the HTML document 601;

FIG. 11A shows the transmission method for used by the transmitting unit 116 for transmitting the transmission data;

FIG. 11B shows a multiplexed stream transmitted in digital satellite broadcasting;

FIG. 12 is a flowchart showing an overview of the procedure of the data transmitting apparatus 110;

FIG. 13 is a flowchart showing an example information obtaining procedure of the information obtaining unit 111;

FIG. 14 is a flowchart showing an example procedure for generating transmission data by the transmission data generating unit 112;

FIG.15 is a flowchart showing a detailed example of the processing in step S1312 of FIG. 14;

FIG. 16 shows an example of the cursor design correspondence table which the control unit 155 generates to control the display position of the cursor design;

FIG. 17 shows an example of the design information stored by the control unit 155;

FIG. 18 shows the display image 1800 which is the initial screen displayed by the display unit 154 based on the transmission data 800 shown in FIGS. 8A to 8C;

FIG. 19 shows the display image 1900 which is the initial screen displayed by the display unit 155 based on the transmission data 900 shown in FIGS. 9A and 9B;

FIG. 20 shows the display image 2000 which is the initial screen displayed on the display unit 154 for the transmission data 1000 shown in FIGS. 10A and 10B;

FIG. 21 is a flowchart showing an example procedure for display control which is performed by the control unit 155;

FIG. 22 is a block diagram showing the construction of the data communication system of the second embodiment of the present invention;

FIG. 23 shows an example of the link information table which is the stored content of the data conversion table storing unit in the second embodiment;

FIGS. 24A to 24C shows the transmission data for the first page of a WWW home page which has been generated from a HTML document and the audio information "Weather.au" according to the second embodiment;

FIG. 25 is a flowchart showing an example of the processing by the transmission data generating unit for an "<H1>" tag in the second embodiment;

FIG. 26 shows an example of the stored content of the design information storage unit in the second embodiment;

FIG. 27 shows the display image for the first screen which is displayed in accordance with the transmission data shown in FIGS. 24A to 24C;

FIG. 28 is a block diagram showing the construction of the data communication system of the third embodiment of the present invention; and

FIGS. 29A to 29C shows the transmission data for the first page of a WWW home page which has been generated from a HTML document and the audio information "Weather.au" according to the third embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

First Embodiment

FIG. 1 is a block diagram showing the construction of the data communication system 100 which is described in the is present embodiment. This data communication system 100 is composed of a data transmitting apparatus 110 and a plurality of data receiving apparatuses 150.

The data transmitting apparatus 110 includes an information obtaining unit 111, a transmission data generating unit 112, a transmission data holding unit 113, a transmission data reading unit 114, a multiplexing unit 115, and a transmitting unit
116

Each data receiving apparatus 150 includes a separating unit 151, a received data holding unit 152, a reproducing unit 153, a display unit 154, a control unit 155, a signal receiving unit 156, and an audio output unit 157.

Construction of the Information Obtaining Unit 111

The information obtaining unit 111 includes a file list storing unit 121 and a buffer (not-illustrated) which holds information obtained from an external database, such as a WWW server. The file list storing unit 121 stores a file list 200 in which the file names of files that are to be obtained by the information obtaining unit 111 and the addresses of these files are stored corresponding to serial numbers which show the order in which the files are to be obtained.

FIG. 2 shows an example of the file list 200 stored in the file list storing unit 121. In the tile names given in this list, the extension "html" indicates that a file is an HTML document, the extension "gif" indicates that a file is an image which has been compressed according to GIF (Graphics Interchange Format), and the extension "au" indicates that a file is audio information in AU format.

This file list 200 shown in FIG. 2 shows the case when the information obtaining unit 111 is connected to the Internet and obtains information from WWW servers. In this example, the rile list 200 is a table in which the URL (Uniform Resource Locator) of a directory on a WWW server is stored in the address column 202 corresponding to each number in the serial number column 201. In the present example, each page in a home page provided by a WWW server can be composed of an HTML document and image files and audio files whose file names are indicated by the HTML document. As a result, the file name of the HTML document for each page is grouped together with the file names of the accompanying image information files and audio files in the file name column 203 of the file list 200.

It should be noted that there can be cases when the address and file names stored in file list storing unit 121 for each serial number in the file list do not need to be recorded separately, so that they may instead be represented using a single URL. It is also possible for files to be obtained not from a WWW server, but from an external database. In this case, the address of the file is expressed as the address of a device in the external database and the file is expressed by a file address in the database.

The information obtaining unit 111 reads a URL and the file names which are to be obtained from the URL from the file list storing unit 121 in ascending order of the serial numbers in column 201. It then accesses the WWW server indicated by the URL to obtain the indicated files. The information obtaining unit 111 assigns file names to the obtained files and stores the files in the buffer.

Examples of Files

The files obtained by the information obtaining unit 111 are described below, with reference to FIGS. 3, 4, 5, and 6.

FIG. 3 shows the HTML document 301 "Report.html" which is the first page of a home page provided by a WWW server. The notation `HTML document 301 "Report.html"` indicates the file of HTML document 301 whose file name is "Report.html."

In HTML documents, character strings written inside "< >" brackets are called tags. These tags represent control codes and are used in pairs written as "<character string>" and "</character string>". The control codes in tags indicate the execution of a corresponding control operation.

Tags "<HTML>" on line 311 and "</HTML>" on line 323 in FIG. 3 indicate that the character strings between these tags form a single HTML document 301.

Tags "<H1>" and "</H1>" on line 312 indicate that the character string "WEATHER REPORT" between these tags is the headline of this document.

Tags "<CENTER>" on line 313 and "</CENTER>" on line 315 indicate that the part of the document expressed by the character strings between these tags should be centered.

`<IMG SRC="Weather.gif">` on line 314 indicates that the image information 401 "Weather.gif" shown in FIG. 4 is to be displayed in the document. Here, "SRC=" is an attribute of tag "<IMG>" and indicates an image information file. The attribute content of "SRC=" is "Weather.gif", indicating a file name.

FIG. 4 shows the image information 401 "Weather.gif" which is an image displayed on the first page of the home page.

As shown in FIG. 4, the image information 401 stored in image information file "Weather.gif" is a map of Japan which includes weather information.

Tags "<P>" on line 316 and "</P>" on line 317 indicate that the character string "TOMORROW, THE WHOLE OF JAPAN WILL ENJOY SPRINGLIKE WEATHER" between these tags is a single paragraph.

Tags "<UL>" on line 318 and "</UL>" on line 322 indicate that the display items expressed by the character strings between these tags are displayed as an itemized list without serial numbers.

Each of the tags "<L1>" on lines 319 and 320 indicates that the character string between this tag and the next "<L1>" or "</UL>" forms an item in the itemized list.

`<A HREF="Tokyo.html"> TOKYO </A>` on line 319 of FIG. 3 indicates that the character string "TOKYO" is linked to the HTML document 501 "Tokyo.html" which is shown in FIG. 5. Here, character strings or images which are linked to other files, such as this character string TOKYO", are called hot spots or anchor points. As one example, if a user uses the mouse to select the hot spot "TOKYO" which displayed on a computer monitor by a browser, the HTML document 501 "Tokyo.html" will be read by the browser and is displayed on the screen. Here, the attribute of tag "<A>", "HREF=", represents a link destination, and the attribute content of "HREF=", in this case "Tokyo.html", indicates a file name for the link destination file.

`<A HREF="Osaka.html"> OSAKA </A>` on line 320 of FIG. 3 indicates that the character string "OSAKA" is linked to the HTML document 601 "Osaka.html" which is shown in FIG. 6. Accordingly, this character string "OSAKA" is also a hot spot. If hot spot "OSAKA" is selected, HTML document 601 "Osaka.html" will be displayed on the screen.

`<A HREF="Weather.au"> AUDIO INFORMATION </A>` on line 321 of FIG. 3 indicates that the character string "AUDIO INFORMATION" is linked to the audio file "Weather.au.", making it another hot spot. If the hot spot "AUDIO INFORMATION" in selected, the audio file "Weather.au." will be reproduced.

FIG. 5 shows the HTML document 501 "Tokyo.html" which is the second page of the home page. The tags included in the HTML document 501 have already been explained, so that the following explanation will only deal with the links to other pages.

`<A HREF="Report.html"> RETURN </A>` on line 511 of FIG. 5 indicates that the character string "RETURN" is linked to the HTML document 301 "Report.html" which is shown in FIG.3.

FIG. 6 shows the HTML document 601 "Osaka.html" which is the third page of the home page.

`<A HREF="Report.html">` RETURN </A> on line 611 of FIG. 6 indicates that the character string "RETURN" is linked to the HTML document 301 "Report.html" which is shown in FIG. 3.

The information obtaining unit 111 may obtain all the files listed in the file list 200 in order and store all of the obtained files in its buffer. Alternatively, the information obtaining unit 111 may obtain the listed files in units of one page and store the obtained files in the buffer. In this latter case, the files for a next page are only obtained after the processing of a current page has been completed by the transmission data generating unit 112.

Construction of Transmission Data Generating Unit 112

The transmission data generating unit 112 includes a data conversion table storing unit 122 and a storage area (not shown in the drawings) which is used as the work area for generating transmission data. The data conversion table storing unit
122 includes a tag table, font files, and a link information table. The tag table is a list of control operations for every available HTML tag which each has its own flag The font files each include character fonts for TV display which are classified for different purposes. The link information table is a table which expresses the link information for hot spots in a format recognized by the data communication system 100. The work area is composed of a file storage area, a tag storage area, a character string storage area, and a flag storage area. The file storage area stores one HTML document file. The tag storage area stores the character strings which are written inside the "< >" brackets of each tag. The character string storage area stores character strings other than the ones between the "< >" brackets. The flag storage area is an area where flags which are used for controlling the generation of display image information for one frame of image data are set. The character strings stored in the tag storage area and the character string storage area are deleted when the control operations corresponding to the tags (flags) have been completed. If a plurality of flags are present in the flag storage area, the flags are set in ascending order and are reset in descending order.

FIG. 7 shows an example or the link information table 700 stored in the data conversion table storing unit 122, where the number, such as "9", are decimal values.

As shown in FIG. 7, the link information stored in the link information table 700 is composed of index information 701 and hot spot information 702.

Index information 701 is composed of an information identification part "INDEX=" for identifying the information as index information and a file identification number expressed as a four-figure decimal value. This file identification number is the identification number of a transmission data file which includes the current piece of index information 701

Hot spot information 702 is composed of an information identification part "HOTSPOT=" for identifying the information as hot spot information, X-Y coordinates "X=999,Y-999", for indicating a cursor position in the current display screen, an instruction "GO.sub.-- TO.sub.-- PAGE" which corresponds to the cursor position given by these coordinates, and a four-figure decimal variable showing the identification number of the transmission file linked to this cursor position.

The transmission data generating unit 112 treats one set of the display image information to be generated along with the accompanying audio information and link information as a single transmission data file, based on one HTML document. Here, the transmission data generating unit 112 establishes a storage area in each or the display image information storing unit 123, the audio information storing unit 124, and the link information storing unit 125 which are provided in the transmission data holding unit 113 (described later) so that the display image information, audio information, and link information to be included in one transmission data file are interrelatedly stored Hereinafter, the storage areas in the display image information storing unit 123, the audio information storing unit 124, and the link information storing unit 125 are respectively called the display image information storage area, the audio information storage area, and the link information storage area.

The transmission data generating unit 112 assigns a same identification number to the display image information storage area, the audio information storage area, and the link information storage area used for storing the corresponding kinds of information in a same transmission data file. Here, the transmission data generating unit 112 manages the audio information and link information in a same transmission data file as separate files which are given the same identification number. This identification number may correspond to the serial number in column 201 of the file list, which in turn corresponds to the file names of the present files which are given in column 203.

The transmission data generating unit 112 fetches an unprocessed HTML document file which has been obtained by information obtaining unit 111 from the buffer in the information obtaining unit 111 in accordance with the serial number 201 in the file list 200. The transmission data generating unit 112 then writes the file into the file storage area of the work area, in addition to generating the index information in accordance with the format of the index information 701 of the link information table 700. This generated index information is then stored at the front of the link information storage area in the transmission data holding unit 113.

The transmission data generating unit 112 reads the tags in order from the start of the HTML document and interprets the tags by looking each tag up in the tag table to find the corresponding control operations. This interpretation of control operation is performed by writing a character string detected after a tag start sign "<" one character at a time into the tag storage area provided in the work area until a tag end sign ">" is detected. The transmission data generating unit 112
then matches the character string in the tag storage area with a tag written in the tag table.

For tags which are not "<A>", "<IMG>", or "<character string preceded by `/`>", the transmission data generating unit 112 sets a flag showing the interpreted control operation in the flag storage area provided in the work area and stores the character strings between the start tag "< >" and the corresponding end tag "</>" into the character string storage area in the work area so as to correspond to the set flag. The storage of character strings between a pair of corresponding tags is performed in the same way as the storage of the character strings included inside the tags themselves. The transmission data generating unit 112 converts the character strings in the character string storage area into text image using the fonts in one of the font files and arranges the text image in accordance with the control operation represented by the current flag to generate display image information. This generated display image information is then added to the display image information storage area provided in the transmission data holding unit 113. Here, when a start tag "<character string>" is followed, not by a character string, but by another start tag "<another character string>", a flag is first set for the former tag in the flag storage area, before the processing is performed for the control operation indicated by the latter tag.

If the read tag is "<ING>", the transmission data generating unit 112 fetches the image information file with the file name specified by the attribute "SRC=" from the buffer of the information obtaining unit 111, and decompresses the image information file under the format specified by the file name extension to convert the format of the image into an appropriate image data format, such as bitmap data or graphics data.

If, for example, the file name extension is ".gif", the transmission data generating unit 112 decompresses the image information file under GIF to convert the image information file into the appropriate format. If a preceding flag is set for a control operation to be performed on the converted image, the converted image is arranged in accordance with this control operation to generate display image information, otherwise the display image information is generated with the converted image being arranged in accordance with an initial setting. This generated display image information is then added to the display image information storage area.

If the read tag is "<A>", the transmission data generating unit 112 checks to see if the "link destination file" specified by attribute "HREF-" of "<A>" is an audio file which has a file name extension, such as "au", which indicates audio information. If the link destination file is an audio file, the transmission data generating unit 112 fetches the audio file from the buffer of the information obtaining unit 111 and converts the audio information into audio data of a predetermined format, before storing it in the audio information storage area.

If the link destination file is not an audio file, the transmission data generating unit 112 generates a text image for the character string between tags <A>and </A>, and arranged the text image at a display position indicated by a preceding flag, or alternatively at a display position specified by an initial setting, with a space being reserved for displaying a cursor. By doing so, the transmission data generating unit 112 generates display image information which is then added to the display image information storage area provided in the transmission data holding unit 113. The transmission data generating unit 112 then calculates the X-Y coordinates for the space reserved for the cursor display position and refers to the hot spot information 702 in the link information table 700 to generate hot spot information from the calculated X-Y coordinates and the "link destination file name" specified by the attribute "RREF=" of tag "<A>". In doing so, the transmission data generating unit 112 refers to the file list 200 and finds the serial number 201 corresponding to the file name in column 203 which in turn corresponds to the link destination file name of tag "<A>", before writing this serial number 201 into the hot spot information as the file identification number. If the link destination file name is not present in the file list 200, the transmission data generating unit 112 writes the file name of the current file into the hot spot information. After doing so, the transmission data generating unit 112 adds the generated hot spot information to the link information storage area provided in the transmission data holding unit 113.

After completing all the above processes for an HTML document, the transmission data generating unit 112 writes a graphic representation of the identification number of the display image information area at a predetermined position in the non-displayed area or the display image information stored in the display image information area. In the present embodiment, the identification number has been described as being a four-figure decimal value, although the number of decimal digits is not limited to four. The identification number may alternatively be represented in binary notation, as a combination of numerals, characters and symbols, as a graphical figure, as a bar code, or even as a file name. Here, the audio information stored in the audio information storage area and the link information stored in the link information storage area are also appended with the identification numbers of the corresponding storage areas, in the same way as with standard digital data files.

Through the processes described above, the transmission data generating unit 112 generates a first, second, and third page of transmission data 800, 900, and 1000, which are respectively the first, second, and third pages of the home page provided by the WWW server, from the HTML document 301, the audio information not shown in the drawings, the image information 401, the HTML document 501, and the HTML document 601.

Transmission Data Generated by the Transmission Data Generating Unit 112

FIGS. 8A to 8C show the transmission data 800 that is the first page of the home page provided by the WWW server. This first page of transmission data 800 has been generated from the HTML, document 301, the audio information "Weather.au," and the image information 401. FIGS. 9A and 9B show the transmission data 900 that is the second page of the home page provided by the wow server which has been generated from the HTML document 501. FIGS. 10A and 10B show the third page of transmission data 1000 that is the third page of the home page which has been generated from the HTML document 601. A shown in FIGS. 8A to 8C, the transmission data 800 includes the display image information 801, the audio information 802, and the link information
803 which is related to display image information 801. Here, FIG. 8A shows the display image which is the content of the display image information 801, FIG. 8B shows a representation of the content of the audio information 802, and FIG. 8C shows the content of the link information 803.

In FIG. 8A, the area surrounded by the dotted line above the display image information 801 is a non-displayed area which is provided in each set of display image information, As its name suggests, this non-displayed area is not displayed on the screen of the display unit 154. An image of an identification number, such as "0001" shown in the drawing, is written into the top-right corner or the non-displayed area by the transmission data generating unit 112. The displayed area of display image information 801 is one display image which is composed of an image which was originally expressed as image information and character strings which have been converted from the original character code files into images.

The audio information 802 is linked to the character string "AUDIO INFORMATION" which is a hot spot in the HTML document 301 Here, the file which includes the audio information 802 is also given the identification number "0001", as shown in FIG.
8B.

The file storing the link information 803 is also given the identification number "0001", as shown in FIG. 8C. This link information 803 is used for control purposes, and is not displayed. "<INDEX=0001>" on line 811 of the link information 803 is the index information which indicates that the file identification number of the transmission data 800 is "000".

The character string on line 812 indicates that instruction "GO.sub.-- TO.sub.-- PAGE(0002)" is related to a position in display image information 801 which is specified by the coordinates (100,600) and that a cursor image held by the data receiving apparatus 150 should be displayed at this position. Instruction "GO.sub.-- TO.sub.-- PAGE(0002)" indicates that a page having identification number "0002", which in this case corresponds to the transmission data 900, should be displayed.

The character string on line 813 indicates that the instruction "GO.sub.-- TO.sub.-- PAGE(0003)" is related to a position in the display image information 801 specified by the coordinates (100,700) and that a cursor image held by the data receiving apparatus 150 should be displayed at this position. This instruction "GO.sub.-- TO.sub.-- PAGE(0003)" indicates that a page having identification number "0003", which in this case corresponds to the transmission data 1000, should be displayed.

FIGS. 9A and 9B show the transmission data 900 which is the second page of the home page provided by the WWW server. This transmission data 900 includes the display image information 901 and the link information 902, which is related to the display image information 901. Here, FIG. 9A shows the display image which is the content of the display image information 901 and FIG. 9B shows the content of the link information 902.

As shown in FIG. 9A, an image of the identification number "0002" is written in the top-right corner of the non-displayed area of the display image information 901 which is shown by the dotted line, in the same way as with the display image information 801.

As shown in FIG. 9B, the file storing link information 902 is given the Identification number "0002".

In FIG. 9B, <INDEX=0002>on line 911 is the index information, indicating that the file identification number for transmission data 900 is "0002".

The character string on line 912 indicates that the instruction "GO.sub.-- TO.sub.-- PAGE(0001)" is related to a position in the display image information 901 specified by coordinates (050,400) and that a cursor image held by the data receiving apparatus 150 should be displayed at this position. This instruction "GO.sub.-- TO.sub.-- PAGE(0001)" indicates that a page having identification number "0001," which in this case corresponds to the transmission data 800, should be displayed.

FIG. 10A and 10B show the transmission data 1000 which is the third page of the home page provided by the WWW server. Transmission data 1000 includes display image information 1001 and link information 1002, which is related to display image information 1001. Here, FIG. 10A shows the display image which is the content of the display image information 1001 and FIG. 10B shows the content of the link information 1002.

As before, an image of the identification number "0003" is written into the top-right corner of the non-displayed area of display image information 1001.

As shown in FIG. 10B, the file storing link information 1002 is given the identification number "0003".

"<INDEX=0003>" on line 1011 of the link information 1002 is the index information, indicating that the identification number of the files of the transmission data 1000 is "0003".

The character string on line 1012 indicates that the instruction "GO.sub.-- TO.sub.-- PAGE(0001)" is related to a position in the display image information 901 specified by the coordinates (050,400) and that a cursor image should be displayed at this position. This instruction "GO.sub.-- TO PAGE(0001)" indicates that a page having identification number "0001", which in this case corresponds to transmission data 800, should be displayed.

Illustrative Example of the Processing by Information Obtaining Unit 111 and the Transmission Data Generating Unit 112

The following is a specific example of the processing performed by the information obtaining unit 111 and the transmission data generating unit 112 in which the files shown in FIGS. 3, 4, 5, and 6 are obtained and are used to generate the transmission data shown in FIGS. 8, 9, and 10.

Processing by the Information Obtaining Unit 111

The information obtaining unit 111 first refers to the file list storing unit 121 and issues a connection request to the indicated WWW server on the Internet. The information obtaining unit 111 then obtains the HTML document 301 "Report.html" from this WWW server, assigns it the file name "Report.html", and stores the file in the buffer. The information obtaining unit 111 also obtains the compressed image information 401, the HTML document 501, and the HTML document 601 in the same way from the WWW server.

Processing by the Transmission Data Generating Unit 112

The transmission data generating unit 112 allocates storage areas in the transmission data holding unit 113 for respectively storing the display image information 801, the audio information 802, and the link information 803 which compose the transmission data 800. In doing so, the transmission data generating unit 112 assigns the identification number "0001" for retrieving transmission data 800 to these storage areas. The transmission data generating unit 112 then fetches the (yet-unprocessed) HTML document 301 from the buffer of the information obtaining unit 111 and writes this document into the file storage area in the work area.

The transmission data generating unit 112 then generates the index information "<INDEX=0001>" shown in line 811 of the transmission data 800 for the first page of the WWW home page from the file name "Report.html" of HTML document 301, before storing the generated index information at the start of the link information storage area for link information 803 which is provided in the transmission data holding unit 113.

The transmission data generating unit 112 then reads the tag "<HTML>" from line 311 in the HTML document 301 and stores the character string "HTML" in the "<HTML>" tag in the tag storage area of the work area. It then refers to the tag table stored in the data conversion table storing unit 122 to interpret the tag, and by doing so recognizes that line 311 is the first line of the HTML document 301. After doing so, it deletes the character string "HTML" from the tag storage area.

Next, the transmission data generating unit 112 reads the tag "<H1>" on line 312 and refers to the tag table to interpret its content. On doing so, it sets the headline flag in the flag storage area in the work area. Here, the headline flag shows that the character string following the "<H1>" tag is a headline and so should be displayed using a headline font. The characters in the character string after the "<H1>" tag are then written one character at a time into the character string storage area until the "</H1>" tag appears, which in the present case results in the character string "WEATHER REPORT" being written into the character string storage area and being converted into display image information using the headline font. This generated display image information is then added to the display image information storage area set in the transmission data holding unit 113. After this, the headline flag in the work area is reset, the character string "WEATHER REPORT" is deleted from the character string storage area, and the character string "H1" is deleted from the tag storage area.

Next, the transmission data generating unit 112 reads the tag "<CENTER>" on line 313 and sets the centering flag in the work area. The centering flag shows that the character string which follows the corresponding tag is to be centered on the display. Here, there is no character string following the "<CENTER>" tag which can be centered, so that the transmission data generating unit 112 continues by reading line 314.

The transmission data generating unit 112 reads the tag `<IMG SRC="Weather.gif">` on line 314 and refers to the tag table to interpret the content of the tag The transmission data generating unit 112 then investigates whether the file for the image information 401, which is expressed by the file name "Weather.gif", is present in the buffer of the information obtaining unit 111, and, since this is the case, reads the file. The transmission data generating unit 112 then converts the image information 401 which is stored and compressed in the read file into a bitmap image or other such format, in accordance with a GIF decompression method,

The transmission data generating unit 112 then reads the tag "</CENTER>" on line 315 and arranges the bitmap image converted from image information 401 in accordance with the centering flag set in the work area. The display image information thus generated is then added to the display image information storage area in the transmission data holding unit 113, before the centering flag in the work area is reset.

The transmission data generating unit 112 then reads the "<P>" tag on line 316 and sets the paragraph flag. The paragraph flag shows that the character strings displayed between this start tag and the "</P" end tag should be displayed as a single paragraph which is to be inserted into the following blank line. As with "WEATHER REPORT" on line 312, the character string "TOMORROW, THE WHOLE OF JAPAN WILL ENJOY SPRINGLIKE WEATHER" between these tags is read and is stored in the character string storage area in the work area. Next, after reading the "</P>" tag, the transmission data generating unit 112 converts the character string "TOMORROW, THE WHOLE OF JAPAN WILL ENJOY SPRINGLIKE WEATHER" into an image using the font for paragraph display which is stored as one of the font files and adds the generated display image information to the storage area in the transmission data holding unit 113 for display image information storage area 801. After this, the content of the work area is cleared as before.

The transmission data generating unit 112 next reads the tag "<UL>" on line 318, interprets it, and sets the itemized list flag in the work area. The itemized list flag shows that each character string which follows the tag and is interpreted as one item should be displayed as a non-numbered item in a list.

The transmission data generating unit 112 next reads the tag "<L1>" on line 319, refers to the tag table, interprets the tag as indicating the start of one item in a list, and sets the item flag in the flag storage area. The item flag shows that the display position on the display screen should be shifted to the next line every time an "<L1>" or "</L1>" tag is read.

The transmission data generating unit 112 reads the tag "<A HREF="Tokyo.html>" following the tag "<L1>" and writes it into the tag storage area. The transmission data generating unit 112 then interprets this tag "<A UREF="Tokyo.html>" and sets the link flag in the flag storage area.

When the extension of the file name given as the attribute of the "<A>" tag indicates audio information, the link flag shows that processing for the audio information is to be performed so that the audio information is converted into a predetermined format and stored in the audio information storage area. When the extension of the file name given as the attribute of the "<A>" tag does not indicate audio information, the link flag shows that the character string between the "<A>" and "</A>" tags which is appended with the link by the "<A>" tags is to be converted into an image with a two-character space provided before it as a cursor display area. The link flag also shows that display image information is to be generated for this character string in addition to hot spot information which is generated in accordance with the format of the hot spot information 702.

The transmission data generating unit 112 reads the character string "TOKYO" between the "<A HREF="Tokyo.html>" and "</A>" tags and writes it into the character string storage area. After reading the "</A>" tag, the transmission data generating unit 112 converts the character string "TOKYO" into an image with a two-character space provided before it as a cursor display area and arranges the character string in accordance with the itemized list flag to generate display image information which it adds to the display image information storage area provided in the transmission data holding unit 113. The transmission data generating unit 112 then calculates the coordinates of the cursor display position as (100,600), and uses these coordinates and the attribute "Tokyo.html" stored in the tag storage area of the work area to generate the hot spot information shown on line 812 of FIG. 8. After doing so, the transmission data generating unit 112 adds the generated hot spot information to the link information storage area provided in the transmission data holding unit 113. Having done so, the transmission data generating unit 112 deletes the character string "A HREF="Tokyo.html" in the tag storage area of the work area and the character string "TOKYO" in the character string storage area, in addition to resetting the link flag.

Next, on reading the "<L1>" tag on line 320, the transmission data generating unit 112 shifts the display position for the next display image to the following line in accordance with the item flag, and, in the same way as with line 319, generates display image information for the character string "OSAKA", in addition to generating the hot spot information shown on line 813 of FIG. 8C. The generated display image information is then added to the display image information storage area provided in the transmission data holding unit 113 and the generated hot spot information is added to the link information storage area. After this, the transmission data generating unit 112 deletes the character string "A HREF="Osaka.html" and the character string "OSAKA", and resets the link flag.

Next, on reading the "<L1>" tag on line 321, the transmission data generating unit 112 shifts the display position for the next display image to the following line in accordance with the item flag, and sets the link flag in accordance with the tag "A HREF="Weather.au". On investigating the file name extension of the attribute in accordance with the link flag, the transmission data generating unit 112 finds that the link destination file is audio information in AU format, so that it converts the AU format audio information into audio information of a predetermined format, before storing the converted audio information in the audio information storage area provided in the transmission data holding unit 113.

Next, on reading the "</L1>" tag on line 322, the transmission data generating unit 112 interprets that the itemized list is complete, and reset the itemized list flag and the item flag.

Finally, on reading the "</HTML>" tag on line 323, the transmission data generating unit 112 interprets that the HTML document 301 has ended, and so terminates the generation process for transmission data 800.

Following this, the transmission data generating unit 112 finds that there is an unprocessed HTML document 501 and so sets a display image information storage area for display image information 901 and a link information storage area for link information 902 in the transmission data holding unit 113 for storing the composite parts of the transmission data 900, in doing so giving both storage areas the identification number "0002" for the retrieval of the transmission data 900. It then reads the unprocessed HTML document 501 from the buffer of the information obtaining unit 111 and writes it into the work area.

The transmission data generating unit 112 then generates the index information "<INDEX=0002>" shown in line 911 of the transmission data 900 which displays the second page of the WWW home page from the file name "Tokyo.html" of the HTML document 501, before storing the generated index information at the start of the link information storage area for the link information 902 which is provided in the transmission data holding unit 113. In the same way as with the generation of the transmission data 800 from the HTML document 301 and the image information 401, the transmission data generating unit 112 then generates the transmission data 900 from the HTML document 501 and the transmission data 1000 from the HTML document 601, with no further explanation of this process being given.

Construction of the Transmission Data Holding Unit 113, the Transmission Data Reading Unit 114, the Multiplexing Unit 115, and the Transmitting Unit 116

The transmission data holding unit 113 includes a display image information storing unit 123, an audio information storing unit 124, and a link information storing unit 125, with simultaneous retrieval from these units being possible.

The display image information storing unit 123 can be realized by RAM (Random Access Memory) or a hard disk device, and is provided with a plurality of display image is information storage areas which are set by the transmission data generating unit 112. Each of these display image information storage areas stores one file of display image information which is generated by the transmission data generating unit 112.

The audio information storing unit 124 can also be realized by RAM (Random Access Memory) or a hard disk device, and is provided with a plurality of audio information storage areas which are set by the transmission data generating unit 112. Each of these audio information storage areas stores one file of audio information which is generated by the transmission data generating unit 112.

The link information storing unit 125 can also be realized by RAM (Random Access Memory) or a hard disk device, and is provided with a plurality of link information storage areas which are set by the transmission data generating unit 112. Each of these link information storage areas stores one file of link information which is generated by the transmission data generating unit 112.

The transmission data reading unit 114 simultaneously reads the display image information, the audio information, and the link information in a some transmission data file from the storage areas provided in the transmission data holding unit 113
in the order of the file identification numbers for the transmission data, and outputs the read information to the multiplexing unit 115. After reading the files for the transmission data which has the final identification number, the transmission data reading unit 114 returns to the transmission data with the identification number "0001" and once again reads the transmission data in the order of the identification numbers. This is to say, the transmission data reading unit 114 cyclically reads the transmission data from the transmission data holding unit 113 in order of identification numbers and outputs the transmission data to the multiplexing unit 115. In doing so, there is the following difference in the reading method when audio information is or is not present. When no audio information is present, the transmission data reading unit 114 advance to the reading of a set of transmission data with the next identification number after reading a first set of transmission data once. When audio information is present, the transmission data reading unit 114 reads the audio information and advances to the reading of a set of transmission data with the next identification number only after reading the display image information and the link information a plurality of times for the period which is required by the reproduction of the audio information. As one example, if the audio information has a reproduction period of two seconds, the transmission data reading unit 114 will read the audio information once, and will read the display image information and link information 60 times (30 frames per second * 2 seconds), before advancing to the reading of a set transmission data with the next identification number. In this way, the transmission time for audio information can be maintained.

The multiplexing unit 115 multiplexes the display image information (including the audio information) and the link information read by the transmission data reading unit 114, and outputs multiplexed data to the transmitting unit 116. Here, this multiplexing can be performed using the same method as conventional teletext broadcasting. In such a case, display image information and audio information are multiplexed in the same way as the images and audio included in conventional TV broadcasts, while link information is multiplexed in the same way as the text information multiplexed with teletext broadcasts. This in to say, when no audio information is present, the display image information is transmitted in the image section of one frame of the television image signal, while the link information is transmitted in the retrace section of the same one frame of the television image signal. When audio information is present, the audio information is transmitted as the television audio signal, while the corresponding display image information and link information are transmitted in the image area and retrace area, respectively, of the television image signal for the number of frames required by the reproduction of the audio information;

The transmitting unit 116 successively transmits the transmission data which has been multiplexed by the multiplexing unit 115 on a TV broadcast ground wave.

Transmission Method for the Transmission Data

FIG. 11A gives a graphic representation of the transmission method used by the transmitting unit 116. FIG. 11A shows the case when n pages (n being a positive integer) of transmission data are generated by the transmission data generating unit
112. In FIG. 11A, a pairing of audio information and display image information with a same identification number is expressed as one transmission unit corresponding to a normal TV broadcast, and the link information for the same identification number is expressed as one transmission unit corresponding to the text information which is multiplexed into a standard teletext broadcast.

As shown in FIG. 11A, in addition to being identified by the some identification number, the display image information, audio information, and link information stored in one transmission data file are transmitted at a corresponding time. Also, the transmission data from the first to the n.sup.th page in the transmission data holding unit 113 are cyclically transmitted in the order of identification numbers.

It should be noted here that while the transmission data reading unit 114 has been described at reading the display image information, the audio information, and the link information stored in the same transmission data file simultaneously from the display image information storing unit 123, the audio information storing unit 124, and the link information storing unit 125 and as having the read display image information, audio information, and link information transmitted with related identification numbers and transmission timing, the display image information and the link information do not need to be transmitted with a related timing. As one example, the transmission data reading unit 114 may instead be composed of a first reading unit and a second reading unit. Here, the first reading unit is constructed to continuously read pairs of display image information from the display image information storing unit 123 and audio information from the audio information storing unit 124
which it then outputs to the multiplexing unit 115. The second reading unit is constructed to