JP2002325239A - Data conference system and data conference terminal, and storage medium for storing data conference program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for displaying a shared screen in real time in a data conference system using PCs, etc. SOLUTION: In the data conference system connecting through IP a plurality of terminals to each other and sharing an application data at each terminal, one terminal receives and stores display capability information of other terminals, and the one terminal converts the window screen data of the application data in response to a display resolution of the other terminals referring to the display capability information and transmit the result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data conference system, and more particularly to a technique for quickly displaying a shared screen on a terminal in a data conference system.

[0002]

2. Description of the Related Art In a conventional video conference system, N
To absorb the video signal system such as TSC, PAL, etc., and convert and compress each frame of the analog video signal to digital data of 352 × 288 bits in order to balance the practical display image quality and movement, and to convert the frame to the TV signal system on the receiving side Process to return to the original video is performed, and the audio is also CODE that conforms to standardization.
There are a plurality of C systems.

In recent years, in addition to a video conference system mainly using video and audio, a remote data conference system using computer data or application sharing has been widely used. For example, the ISDN data transmission channel ML
2. Description of the Related Art Systems for providing a PC presentation to a remote PC using an IP data exchange function using a P (Multi Layer Protocol) have become widespread.

Conventionally, this flow is based on a meeting by exchanging line drawings and character information written on an electronic whiteboard with each other.
This can be said to be a shift to online computer presentations using Microsoft's PowerPoint software.

[0005] In the online presentation in such a data conference system, there is a problem that a screen cannot be displayed on a partner terminal in real time due to a large amount of data to be handled. That is, when Microsoft PowerPoint software or the like generally used in a data conference system is used, the file is transmitted one page at a time to the remote side at the time of a remote conference or the like.
It takes time to be displayed to the other party by AN, ISDN, or the like. In addition, there is a problem that the so-called page turning is slow, the time required for turning the page varies depending on the content of each page, and it is difficult to use.

As a prior art relating to such a problem, Japanese Patent Application Laid-Open No. Hei 9-294255 discloses a technique proposed for the purpose of improving the time delay when a high-end CAD data is remotely transmitted and discussed based on the data. There is an invention. Japanese Patent Application Laid-Open No. 9-294255 proposes that moving image and still image data be sent to a partner terminal using a file transfer means so that applications can be shared between workstations, and the terminals synchronously display during presentation. ing.

[0007] However, this proposal does not disclose means for transmitting a large amount of data in real time, but merely shows a practical measure such as separately using physical transport.

Japanese Patent Application Laid-Open No. 7-49834 proposes a method for running a program of a remote computer using virtual network computing (VNC) technology. In Japanese Patent Application Laid-Open No. 7-49834, when a screen output of a host computer on which an application is started is captured and transferred to a remote side, the screen is divided into a static part and an operation part such as annotation, and 10 object structures are provided. The method of sending by the parameter of is proposed.

[0009] However, no consideration is given to the problem of using an application that needs to transmit bitmap data. Further, attention is paid to handling objects such as annotations, and no means for transferring display data at high speed is disclosed.

[0010] Further, Japanese Patent Application Laid-Open No. Hei 10-79770 proposes an invention for transferring an electronic medical record composed of a large amount of image information at a high speed. In the present invention, a part of the image information is
The link description is written in / HTML, and the above-mentioned link description chart is created at the read workstation, and the linked data is read from the stored server.

However, this requires a dedicated server and is not suitable as a technique for realizing a presentation that requires one-to-one or one-to-N real-time performance.

[0012]

As described above, in the prior art, when Microsoft PowerPoint software or the like generally used in a data conference system is used, a display screen is displayed to the other party. The problem of taking a long time has not been solved.

The present invention has been made in view of the above points, and has as its object to provide a technique for displaying a shared screen in real time in a data conference system using a PC or the like.

[0014]

In order to achieve the above object, the present invention can be configured as follows.

According to a first aspect of the present invention, there is provided a data conferencing system in which a plurality of terminals are mutually connected by IP and application data is shared and used by each terminal, wherein one terminal is a display of another terminal. The one terminal receives and stores the display capability information, the one terminal converts the window screen data of the application data according to the display resolution of the other terminal with reference to the display display capability information, and transmits the converted data.

According to the present invention, since data matching the display resolution of the data transmission partner is transmitted, data having a higher resolution than necessary as in the prior art is not transmitted, and the page on the receiving side is not transmitted. The display speed can be improved.

According to a second aspect of the present invention, in the first aspect, receiving and storing the display display capability information includes transmitting the display capability read request from the one terminal to the other terminal. Receiving a response from the other terminal,
The content of the response is analyzed, and the analysis result is stored as display display capability information of the other terminal.

According to the present invention, it is possible to automatically obtain the display capability information of another terminal.

According to a third aspect of the present invention, in the second aspect, the other terminals are plural, and the conversion is performed for each terminal according to the display resolution of each terminal.

According to the present invention, even when page data is displayed on a plurality of terminals, it is possible to transmit data having a resolution suitable for each terminal.

According to a fourth aspect of the present invention, in the data conferencing system according to any one of the first to third aspects, the one terminal includes a plurality of pages of the converted window screen data. And the index tag information corresponding to the window screen data to the other terminal, the other terminal stores the received window screen data and the index tag information, and the one terminal The page to be displayed on the display of the terminal is specified by the index tag information, and the other terminal displays the page specified by the index tag information on the display.

According to the present invention, since the data whose resolution has been converted is transmitted to the partner terminal, transmission can be performed quickly.

According to a fifth aspect of the present invention, there is provided a data conference system in which a plurality of terminals are connected to each other by IP, and application data is shared and used by each terminal. The data conference system accommodates the plurality of terminals. It has a plurality of servers, each server holds the display display capability information of the terminal accommodated in each server, one terminal,
Transmit window screen data for a plurality of pages of the application data and index tag information corresponding to the window screen data to a server to which another terminal belongs, and use the index for display on the other terminal from the one terminal. When the page is specified by the tag information, the server converts the window screen data corresponding to the index tag information with reference to the display display capability information according to the display resolution of the other terminal, and Send to

According to the present invention, window screen data and index tag information for a plurality of pages are transmitted to the server to which the destination terminal belongs, and the window is adjusted so that the server matches the resolution of the destination. Since the screen data is converted and transmitted to the transmission destination, the display speed can be improved.

According to a sixth aspect of the present invention, there is provided a host computer and a terminal connected to the host computer by IP connection. The display screen data in the host computer is window-captured and transmitted to the terminal. A data conferencing system for displaying display screen data on said terminal, wherein said host computer receives and stores display display capability information from said terminal, and said host computer displays said window captured display screen data on said display. With reference to the display capability information, conversion is performed according to the display resolution of the terminal, and transmitted to the terminal.

According to the present invention, the display at the destination terminal can be performed finely, and the display speed can be improved by reducing data by resolution conversion.

According to a seventh aspect of the present invention, in the sixth aspect, receiving and storing the display display capability information includes transmitting the display capability read request to the terminal by the host computer, Is received, the content of the response is analyzed, and the analysis result is stored as display display capability information of the terminal.

According to the present invention, according to the present invention, the host computer can automatically obtain the display capability information of the terminal.

According to an eighth aspect of the present invention, in the seventh aspect, the plurality of terminals are provided, and the conversion is performed for each terminal according to the display resolution of each terminal.

According to the present invention, even when page data is displayed on a plurality of terminals, it is possible to transmit data having a resolution suitable for each terminal.

According to the ninth to twelfth aspects of the present invention,
And a terminal suitable for use in the data conferencing system according to any one of the first to fourth aspects.
The host computer is suitable for use in the described data conferencing system, and has the same effect as described above. The invention of claim 16 is a recording medium on which a program for executing the processing of the terminal is recorded, and the invention of claim 17 is a recording medium on which a program for executing the processing of the host computer is recorded. The same operation and effect as described above are achieved.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS. 1 to 4 show examples of the configuration of a data conference system used in an embodiment of the present invention.
Shown in

The configuration shown in FIG. 1 is a device configuration in a case where an external PC (personal computer) is IP-connected to a conventional video conference system for data conference, and FIG. 2 shows the connection configuration. That is, the microphone / speaker 2, the remote controller 3, the television monitor 4, and the personal computer 5 for data conference are connected to the television conference system main body 1.

The configuration shown in FIG. 3 uses a PC (personal computer) and operates the PC OS (Windows).
This is a configuration example of a data conference system based on an OS (OS), and has a configuration in which personal computers 6 and 7 are connected via an IP network 8 and an ISDN network 9. FIG. 4 shows a connection configuration of PCs in the data conference system shown in FIG. As shown in FIG. 4, various kinds of communication can be performed by the interface board shown in FIG.

In these data conference systems, application sharing is realized by software mounted on a PC. FIG. 5 shows a conventional example of the software configuration. In the configuration shown in FIG. 5, Microsoft's Netmeeting is used as an example of software for realizing application sharing. As a connection protocol for application sharing, as shown in FIG. A protocol based on the 120 series is used.

In describing the detailed configuration of the present invention in the above configuration, first, an analysis result regarding the problems of the prior art will be described.

When a Microsoft PowerPoint is used for sharing an application in the data conference system, the page data includes, for example, text information of a sentence and an attachment read from a scanner / digital camera or the like as shown in FIG. FIG. 1 and accompanying FIG. 2 are included. Here, when one page is displayed from the transmitting terminal, the page information is transmitted to the other party (remote side) along the path shown by the dotted line in the software processing group of FIG. 5 and displayed on the monitor display.

FIG. 8 shows the time required for this display to be measured using the configuration of the data conference system shown in FIG. In the figure, the upper part shows the result when data is transmitted from PC7 to PC6 in FIG. 3, and the lower part shows the result from PC6 to PC6.
7 shows the result when data is transmitted.

As shown in FIG. 8, in the case of ISDN connection, the first page requires 17 seconds to be displayed on the partner terminal, and the second page requires 35 seconds. This is a "cover" in which the first page is filled with about 10 characters as title characters, and the second and third pages are "attached figures" in which the configuration diagram shown in FIG. Some pages are pasted together, and the second and third pages have a large amount of data per page.

Normally, the resolution of the original image (from FIG. 1) read from the scanner / digital camera is 300 DPI.
(PPI) and 600 DPI (PPI). On the other hand, a 17-inch C which is a general computer display
Since the resolution when XGA display is performed at 1024 × 768 dots on an RT is about 100 DPI (PPI), the resolution of the original image is higher than the resolution which is sufficient for display at the size fitted in the other party, that is, an over-spec resolution. Is held in. At this point, it is sufficient to reduce the resolution by thinning out the data in the attached drawing when creating the page data, but it can also be used for other purposes, and the work of creating this presentation data page is thinned out due to the characteristics that require creativity. When processing or the like is performed, it is rare that the processing is executed due to a bad effect such as interruption of the concentration of thought.

In view of the above analysis results, the present invention uses the "resolution conversion processing" means shown in FIG. 9 to convert the page data on the transmission side into a resolution suitable for the capability of the partner terminal, and transmit the page data to the partner terminal. I do.

Next, the resolution conversion processing will be described.

First, as shown in FIG. 10, the page data is expanded on the transmitting side into a "virtual display area" (a memory area in a bitmap format) (step 1), and this is converted into a resolution corresponding to the display of the partner terminal. (Step 2). The conversion is performed with reference to an image resolution / size and conversion degree correspondence table as shown in FIG. For example, P
In the case of the SVGA 10.4 "panel with ANEL number 6, the resolution of the page data is converted to 96 PPI (96 DPI).

Then, a data compression process is performed (step 3). For data compression, JPEG, GIF, TIFF, and other conventional techniques can be used. Further, there is a case where the compression format is the same as the compression format of the original drawing, and a case where the compression format is another format. For example, if the number of display colors of the display device of the other party is 128
In the case of color (7 bits) or less, JPEG generates a useless data amount. Therefore, if the original figure is JPEG, another format is used.

In the past, since unnecessary information was transmitted, no deterioration in image quality occurs on the display side even if the resolution conversion is performed as described above. Also, for reference, FIG.
Fig. 2 shows an example of the image resolution and the data amount. For example, XGA
The amount of information per screen when displaying 16-bit color on a panel is 1.572 Mbytes.

In a data conference system using a PC or the like, since the other party is not always a fixed party like a video conference call, it is necessary to obtain display display resolution information of the other party. The procedure will be described below.

As a method of acquiring the display resolution information (display capability) of the other party, for example, there is a method of acquiring the information from the other terminal every time a communication path is set. The procedure will be described with reference to the flowchart of FIG.

After the terminal on the host side and the terminal on the remote side are connected, each terminal performs initialization (steps 11 and 12). The terminal on the remote side stores the capability of the terminal itself in the storage device, and declares the capability in step 22. The terminal on the host side reads the capability read request (step 1).
When 2) is performed, the remote terminal receives the request (step 23) and returns a response to the host terminal (step 24).

The terminal on the host side receives it (step 13), analyzes the capabilities of the remote side terminal, and stores it (step 14).

Further, the capability information of the partner with whom communication has been performed once may be stored in the external storage area, and the stored capability information may be used from the second time. Further, the user may store the partner information in the external storage area as an initial setting when the system is installed.

Further, the user may store the other party information in the external storage area at an appropriate time, or input and set from a keyboard or the like every time a communication path is set. For example, a question such as "Is your TV XGA?" At the beginning of a data conference connection, such as a voice or camera video greeting, is set, and the answer is manually set. Alternatively, the answer may be automatically set by voice recognition processing. As described above, the capability information may be mutually exchanged only when the communication is performed for the first time with a specific partner, the capability information may be manually set, and the set information may be used as a default value from the second time. Further, it is also possible to make all the connections in the dedicated connection server system, register the display capability information in addition to the connection address as the registration information, and use it.

By storing the display capabilities of a plurality of terminals in the form of a table shown in FIG. 11, resolution conversion processing is performed for a plurality of remote terminals, and an optimum image is transmitted to each of the other terminals. It becomes possible.

According to the first embodiment, by setting the page data of the application to match the resolution and size of the display of the other party, the amount of data per page is optimally minimized, and high-speed display can be performed. . Further, the display can be beautifully displayed on the other party at the resolution most suitable for the display.

Further, the technology of the present invention is applied to a case where the IMT
It can also be used when participating in a TV conference with a mobile phone terminal such as 2000 and viewing PC presentation data on the screen of the mobile phone terminal at that time.

[Second Embodiment] In the second embodiment, the virtual network computer (VNC) technology disclosed in Japanese Patent Application Laid-Open No. 7-49834 discloses a technology different from the application sharing in the first embodiment. Means for displaying / executing the application. According to this technique, a terminal on a remote side starts an application on a host side terminal that executes a program by using a configuration unit on an upper side in FIG. 14, and transmits data displayed on a display to a “graphical device interface [GDI ]], The data (display of Windows (registered trademark) information supplemented on the host side) is transmitted to the other side via the connection API, and the other side displays the data.

The technique described in Japanese Patent Laid-Open No. 7-49834 describes a method of transmitting object data to be written on a still image basically to a remote side based on background data of a still image. There is a description that a bitmap is compressed and transmitted as background data, but the transmission timing is not disclosed.

In the present embodiment, in order to realize a smooth presentation of the presentation material in the presentation scene of the conference, the feedback image is sent to the remote side without delay when the pages of the presentation material are turned one after another. To

The detection of the feedback timing is as follows.
When a page forward (next page, previous page) instruction of an application is given, it is performed by receiving a trigger from the application, or “GDI
This may be performed by comparing the buffer at the time before the “capture” with the current capture content at a predetermined timing.

Here, for example, 1024 × 76
Performs 8-bit window display and 64
When a VGA window display of 0 × 400 bits is performed, a saddle (hidden display) occurs as shown in the lower right of FIG. In such a case, it is necessary for the user to scroll the screen up / down / left / right in order to see the saddle portion. In some cases, margins are generated.

In order to solve this problem and display the screen on the client side without any bleeding or the like, in the present embodiment, the resolution of the captured data is changed to the capability of the display on the remote side by the resolution conversion processing used in the first embodiment. Convert together. FIG. 1 shows a configuration when the resolution conversion processing is used.
6 is shown. As shown in FIG. 16, resolution conversion and data compression are performed in the same manner as in the first embodiment. The example shown in FIG. 16 shows an example in which resolution conversion and data compression are performed for two types of remote terminals. This conversion may be performed on the entire screen at one time, or, as shown in the upper right of FIG. 9, may be divided into display data 1 to display data 4 and transmitted only in the area where the data change exists. You may.

In addition, when the change is detected in four divisions at a predetermined timing, and when a change point occurs in a specific divided screen, for example, the area of the display data 1,
It is also possible to perform processing of the combination timing with conversion processing of the entire screen and transmission to the remote side through the connection API.

The resolution information required for the above processing is
It can be obtained in the same manner as in the first embodiment.

In this embodiment as well, by performing a plurality of resolution conversion processes for the remote side, it is possible to transmit an optimal image to each other.

According to the present embodiment, even if remote terminals having displays having different display capacities are connected to the host by VNC, the display image of the host can be correctly displayed on each remote display. Also, the color reproduction capability of the display device (the video controller that controls the
In the case where the other terminal is 16 bits with a 2-bit color number, the color resolution can be reduced by the resolution conversion, so that a large data reduction effect can be obtained as in the first embodiment.

[Third Embodiment] Next, a third embodiment of the present invention will be described.

It has been described that the presentation data in FIG. 7 includes the “figure” of (F) for each page (E) and that the display information is over-specification resolution information. Further, in the method described above, the method of transmitting the page information in real time in the “step of expanding to a virtual display” and the “step of performing a resolution conversion process” in FIG. 10 has been described.

In the present embodiment, “expansion to virtual display” and “resolution conversion processing” are performed collectively for a plurality of pages, index tag information for each page is generated, and before starting a presentation in a conference scene, The data is transmitted to each conference participant terminal, and a display instruction is given based on the generated index tag information. FIG. 17 shows a processing flow in this embodiment.

When the presentation data transfer is started on the host side by a user operation or the like (step 31), the resolution conversion / compression of the presentation data is performed in the same manner as the resolution conversion / compression processing described so far (step 31). 32),
After the page tag is attached (step 33), an instruction to store data to the remote terminal is issued (step 34).

On the remote side, the data subjected to the above processing is received (step 41), and the tag data is separated and stored (step 42). Then, the presentation data is stored (step 43), and a storage completion notification is sent to the host (step 44).

The host side receives the storage completion notification (step 35), displays the fact (step 36), and instructs the remote terminal to display a page using the index tag at the time of the data conference (step 35). 37). And
At the remote terminal, data corresponding to the page tag is displayed.

The display capability of the partner terminal can be obtained in the same manner as in the first embodiment. A display instruction method using a tag is known.
0 can be performed with SGML / HTML tags.

Also in this embodiment, since the page data is converted in resolution, even when a plurality of pages are transmitted collectively, they can be transmitted to the partner terminal at high speed.

As in the present embodiment, the method of directly sending data to the connection partner terminal is an end-to-end process. For example, it is necessary to earn time in the first "greeting time" or the like, and there is a problem in operability. May come out. Also, when there is a path with a small transmission path capacity, it may take a very long time for data transmission.

Therefore, as shown in FIG. 18, a large-scale network configuration in which servers for managing the address, telephone number, presence / absence information, display capability, and the like of the connection partner are distributed and arranged for each region may be employed. it can. For example, each server retains the display capabilities of the terminals it houses,
to manage.

In this configuration, the communication partner is virtually connected at the presentation rehearsal before the connection, and the presentation display data (window data) is forwarded to the server closest to the partner terminal or directly accommodated.

That is, the server intervenes between the host terminal and the remote terminal in the sequence shown in FIG. 17, and the server receives the presentation data from the host. When the host terminal issues a page display instruction using an index tag, the server performs resolution conversion processing according to the display capability of the remote terminal, and transmits the converted screen data to the remote terminal.

That is, uncompressed (non-resolution conversion) transfer is performed between the source terminal and the destination server, and resolution conversion + compression of the present invention is performed between the destination server and the destination terminal (resolution conversion + compression is performed by the destination server). Do). The resolution conversion processing of the present invention makes it possible to quickly transfer data between the server closest to the partner terminal and the terminal.

The processing of the terminal, the host computer, the server and the like in each of the above embodiments can be realized by installing a program stored in a CD-ROM or the like for executing the processing of the present invention in the computer.

The present invention is not limited to the above embodiments, but can be variously modified and applied within the scope of the claims.

[0080]

As described above, according to the present invention, data matching the display resolution of the data transmission partner is transmitted from the window screen data transmission side. Is not transmitted, and the page display speed on the receiving side can be improved.

Further, in the configuration for transmitting the display screen data captured by the window, the resolution conversion processing of the present invention makes it possible to perform a clear display at the terminal of the transmission destination and to reduce the display speed by reducing the data by the resolution conversion. Can be improved.

[0082]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a data conference system using a video conference system.

FIG. 2 is a connection configuration of the data conference system shown in FIG.

FIG. 3 is a diagram illustrating a configuration example of a data conference system configured based on a PC;

FIG. 4 is a diagram showing a connection configuration of the data conference system shown in FIG. 3;

FIG. 5 is a diagram illustrating an example of a software configuration of a PC terminal in the data conference system.

FIG. FIG. 2 is a diagram showing a part of a protocol configuration of the data conference system described in H.120.

FIG. 7 is a diagram illustrating a configuration example of page data.

8 is a diagram showing an example of a screen display time in the configuration of the data conference system shown in FIG.

FIG. 9 is a diagram illustrating a position of a resolution conversion process in the software configuration of the PC terminal.

FIG. 10 is a diagram for explaining a resolution conversion process / compression process.

FIG. 11 is a diagram showing an image resolution / size and conversion degree correspondence table.

FIG. 12 is a diagram illustrating an example of an image resolution and a data amount.

FIG. 13 is a diagram showing a procedure for acquiring display display resolution information (display capability) of the other party.

FIG. 14 is a diagram showing a configuration in a VNC.

FIG. 15 is a diagram for explaining a problem when the same capture data is transmitted to displays of different resolutions in the VNC technology.

FIG. 16 is a diagram showing a resolution conversion position of capture data in the VNC.

FIG. 17 is a diagram illustrating a procedure of a process in a case where a presentation is performed using an index tag.

FIG. 18 is a diagram illustrating a configuration example in which servers are distributed and arranged for each region.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video conference system main body 2 Microphone and speaker 3 Remote control 4 Television monitor 5 Personal computer for data conference 6, 7 Personal computer 8 IP network 9 ISDN network

Claims (17)

[Claims] 1. A data conferencing system in which a plurality of terminals are mutually connected by IP and application data is shared and used by each terminal, wherein one terminal receives display display capability information of another terminal. A data conference system, wherein the one terminal converts and transmits window screen data of the application data according to the display resolution of the other terminal with reference to the display display capability information. 2. The method according to claim 1, wherein the receiving and storing the display capability information comprises: the one terminal transmitting a display capability read request to the other terminal; receiving a response from the other terminal; 2. The data conference system according to claim 1, wherein the content of the data conference is analyzed and the analysis result is stored as display display capability information of the other terminal. 3. The data conference system according to claim 2, wherein the other terminals are plural, and the conversion is performed for each terminal according to a display resolution of each terminal. 4. The data conference system, wherein the one terminal transmits the converted window screen data for a plurality of pages and index tag information corresponding to the window screen data to the other terminal, The other terminal stores the received window screen data and the index tag information, the one terminal specifies a page to be displayed on the display of the other terminal by the index tag information, and the other terminal specifies the page to be displayed on the other terminal. 4. The data conference system according to claim 1, wherein a page specified by the index tag information is displayed on a display. 5. A data conference system in which a plurality of terminals are mutually connected by IP and application data is shared and used by each terminal, wherein the data conference system has a plurality of servers accommodating the plurality of terminals, Each server holds display display capability information of a terminal accommodated by each server, and one terminal stores window screen data for a plurality of pages of the application data and index tag information corresponding to the window screen data. When the page is specified by the index tag information for display on the other terminal from the one terminal, the server transmits the window screen data corresponding to the index tag information. Is changed according to the display resolution of the other terminal with reference to the display display capability information. A data conferencing system for transmitting the data to another terminal. 6. A host computer and a terminal connected to the host computer by IP connection, display screen data of the host computer being window-captured and transmitted to the terminal, and displaying the window-captured display screen data to the terminal. A data conference system for displaying, wherein the host computer receives and stores display display capability information from the terminal, and the host computer refers to the window captured display screen data with reference to the display display capability information. A data conferencing system, wherein conversion is performed according to the display resolution of the terminal, and the converted data is transmitted to the terminal. 7. The method of receiving and storing the display display capability information, wherein the host computer transmits a display capability read request to the terminal, receives a response from the terminal, and analyzes the content of the response. 7. The data conference system according to claim 6, wherein the analysis result is stored as display display capability information of the terminal. 8. The data conference system according to claim 7, wherein there are a plurality of terminals, and said conversion is performed for each terminal according to a display resolution of each terminal. 9. A terminal in a data conference system in which a plurality of terminals are connected to each other by IP, and application data is shared by each terminal, wherein the terminal receives and stores display display capability information of another terminal. And a means for converting window screen data of the application data with reference to the display display capability information according to the display resolution of the other terminal, and transmitting the converted data. 10. A means for receiving and storing the display display capability information, comprising transmitting a display capability read request to the other terminal, receiving a response from the other terminal, and analyzing the content of the response. 10. The terminal according to claim 9, further comprising means for storing an analysis result as display display capability information of said another terminal. 11. The terminal according to claim 10, wherein there are a plurality of said other terminals, and said conversion is performed for each terminal according to a display resolution of each terminal. 12. A means for transmitting the converted window screen data for a plurality of pages and index tag information corresponding to the window screen data to the other terminal, and a page to be displayed on a display of the other terminal. 10. A means for designating with the index tag information.
12. The terminal according to any one of claims 11 to 11. 13. A terminal having a host computer and a terminal connected to the host computer by IP, window-capturing display screen data in the host computer, transmitting the window-captured display screen data to the terminal, and transmitting the window-captured display screen data to the terminal A host computer in a data conference system for displaying, a means for receiving and storing display display capability information from the terminal; and displaying the window-captured display screen data by referring to the display display capability information. Means for converting according to the display resolution and transmitting the converted data to the terminal. 14. The means for receiving and storing the display capability information transmits a display capability read request to the terminal, receives a response from the terminal, analyzes the content of the response, and analyzes the analysis result. 14. The host computer according to claim 13, further comprising means for storing as display display capability information of the terminal. 15. The host computer according to claim 14, wherein there are a plurality of said terminals, and said conversion is performed for each terminal according to a display resolution of each terminal. 16. A recording medium storing a program for causing a terminal in a data conference system in which a plurality of terminals execute IP connection with each other and share and use application data among the terminals to execute a process, wherein the terminal is connected to another terminal. Receiving and storing display display capability information; and converting and transmitting window screen data of the application data according to the display resolution of the other terminal with reference to the display display capability information. A recording medium on which a program is recorded. 17. A host computer and a terminal connected to the host computer by IP connection, window display data of the host computer is window-captured and transmitted to the terminal, and the window-captured display screen data is transmitted to the terminal. A recording medium recording a program for causing a host computer in a data conference system to execute processing to display, a procedure of receiving and storing display display capability information from the terminal, and storing the window-captured display screen data, A program for performing a procedure of referring to display display capability information, converting the display resolution information in accordance with the display resolution of the terminal, and transmitting the converted information to the terminal.