JPH09238135A - Transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute carious various conference forms by providing the authority of sponsorring the conference to one of a plurality of transmitters forming a conference via a network so as to allow the transmitter to decide designation of presentation installation and designation of utterance inhibit or the like. SOLUTION: Each of image transmitters 110, 120, 130, is provided with a CPU, a memory a key board, a display device, a speaker, a HDTV camera and a microphone and connects top a network line via transmission control units 111, 112, 121, 122, 131, 132 to conduct a multi-point conference. For example, the image transmitter 110 being a conference sponsorring installation registers an HDTV image or the like used by a presentation installation in the conference top memories of the image transmitters 120, 130 in advance via a multi-point control unit(MCU) 201 and also outputs commands to display a required image onto the display device at any time associated with the progress of the conference to the network. For example, in the case of a lecture, the transmitter 110 sends a command to inhibit an output to the network other than the installation making a presentation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission system for transmitting data to another place.

[0002]

2. Description of the Related Art Conventionally, images and sounds are sent to a remote place,
A system is used in which a conference is held between distant points by displaying and reproducing them at a remote place. In conventional systems, an NTSC television signal is often used as an image signal to be transmitted. However,
The image resolution of an NTSC television signal is not high. Therefore, even if you transfer an image such as a slide photograph (for example, a picture taken with a microscope) used in research meetings and academic societies in fields such as medicine and science, the image quality sufficient for the other party to understand can be obtained. It wasn't the image I had.

For such applications, high-definition image transmission is required. Therefore, an image transmission system that can use high-definition images in a conference at a plurality of distant points is required.

[0004]

Consider, for example, a case where a plurality of devices connected on a network communicate with each other to hold a conference. There are various forms of meetings. For example, in the free debate format and the lecture format,
The restrictions on who can speak are different. It is an object of the present invention to provide a transmission system that can support various conference types.

[0005]

In order to solve the above problems, the present invention provides a plurality of transmission devices capable of transmitting or receiving data, and data transmission between the plurality of transmission devices connected to the plurality of transmission devices. A transmission system in which a control unit that manages transmission is network-connected, and information about the plurality of connected transmission devices is set in at least one of the plurality of transmission devices, and the information is set. It is configured to be sent to the control unit.

The information may include information indicating whether or not the control unit accepts data transmission from each transmission device. The control unit may determine whether to accept the data transferred from the transmission device, based on the information.
The data may be image data, data instructing display of an image, or drawing data.

Further, according to the present invention, a plurality of transmission devices capable of transmitting or receiving data and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices are networked. In the connected transmission system, the transmission device includes an image input unit for inputting image data, an image transfer unit for transferring a plurality of the image data from the image input unit, and a plurality of the image transfer units for the image transfer unit. A display instruction unit that outputs an instruction signal for displaying at least one of the plurality of image data after transferring the image data, and at least one of the plurality of image transmission devices includes A configuration is provided for setting information regarding the plurality of connected transmission devices, and the information is sent to the control unit.

Further, according to the present invention, a plurality of transmission devices capable of transmitting or receiving data and a control unit connected to the plurality of transmission devices for managing data transmission between the plurality of transmission devices are networked. A connected transmission system, wherein at least one of the plurality of transmission devices is connected.
One has setting means for setting information on the plurality of connected transmission devices and sending the information to the control unit, and the control unit has storage means for storing the sent information. At least one of the plurality of image transmission devices is configured to have means for requesting the control unit to return the information, and means for displaying the returned information.

Further, the present invention provides a network comprising a plurality of transmission devices capable of transmitting or receiving data, and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices. A connected transmission system, wherein at least one of the plurality of transmission devices is connected.
One has a setting means for setting information on the plurality of connected transmission devices and sending the information to the control unit, and the control unit stores image data or drawing data transferred from the transmission device. The image data or the drawing data is received and transferred to another transmission device based on the information.

Further, the present invention provides a network comprising a plurality of transmission devices capable of transmitting or receiving data, and a control unit connected to the plurality of transmission devices for managing data transmission between the plurality of transmission devices. In the connected transmission system, the transmission device includes an image transfer unit that transfers the plurality of image data, and a plurality of the image data after transferring the plurality of image data from the image transfer unit. Display instruction means for outputting an instruction signal for displaying at least one of the above, and drawing data transfer means for creating and transferring drawing data, and at least one of the plurality of transmission devices is connected. And setting information relating to the plurality of transmission devices, and sending the information to the control unit, wherein the control unit is transferred from the transmission device. Receiving image data or drawing data or instruction signals, and configured to transfer the image data or drawing data to the other transmission device based on the information.

The control unit may determine whether to accept the transferred image data or drawing data or an instruction signal based on the information. The control unit may determine whether to transfer the transferred image data or drawing data or an instruction signal to all of the transmission devices or to the specific transmission device based on the information. Good.

[0012]

FIG. 2 is a diagram showing the configuration of a screen transmission system according to an embodiment of the present invention. In FIG. 2, transmission control units 111, 121, 121, 122, 131, 132, 32 are connected to the network line 2. The image transmission devices 110, 120, 130 and the multipoint control unit 140 are connected to the respective transmission control units. In this system, three image transmission devices are connected via a network, but if there are two or more,
You can connect as many as you want. The respective image transmission devices are installed at different points (remote locations).

FIG. 1 is a diagram showing the configuration of the image transmission apparatus 110. The other image transmission devices 120 and 130 have the same configuration. In FIG. 1, a CPU (central processing unit) 12 is
It is connected to the transmission control unit 112, and inputs high-definition digital image data sent from another image transmission device via the transmission control unit 112, or to another image transmission device via the transmission control unit 112. It also outputs high-definition digital image data. CP
A display device 13, a keyboard 14, and a storage device 15 are connected to U12. As the storage device 15, a device using a large-capacity storage medium such as a hard disk device or an optical disk device is used, and high-definition digital image data is stored therein. The operator uses a pointing device such as the mouse 25 other than the keyboard 14 while watching the content displayed on the display device 13. Also tablets 26
May be used.

The HDTV camera 17 is a camera for capturing a high-definition image (image according to the HDTV system). The HDTV image signal (analog image signal) output from the HDTV camera 17 is the HDTV input / output device 16
Is input to The HDTV input / output device 16 converts the input analog image signal into digital image data and outputs CP.
Output to U. The HDTV input / output device 16 is a CPU
The digital image data input from 12 is converted into an analog image signal and output to the switching device 22. The digital image data input to the HDTV input / output device 16 is temporarily stored in the frame memory 24. And HDTV input / output device
Reference numeral 16 reads digital image data from the frame memory 24, converts it into an analog image signal, and outputs it.

The NTSC input / output device 18 is connected to the transmission control unit 111, and inputs NTSC digital image data sent from another image transmission device via the transmission control unit 111, or the transmission control unit 111. The NTSC digital image data is output to another image transmission device via 111. The NTSC I / O device 18
An NTSC camera 19, a speaker 20, and a microphone 21 are connected.

The NTSC camera 19 is a camera for capturing an NTSC image. The NTSC image signal (analog image signal) output from the NTSC camera 19 is NTS
It is input to the C input / output device 18. NTSC I / O device 18
Converts the input analog image signal into digital image data and outputs the digital image data to the transmission control unit 111. Microphone 21
The voice is input from. Input audio signal, NTSC
It is converted into digital audio data by the input / output signal 18 and output to the transmission control unit 111 together with the digital image data.

The digital image data input from the NTSC I / O device 18 transmission control unit 111 is converted into analog image data and output to the switching device 22. The switching device 22 selectively outputs one of the analog image signals input from the HDTV input / output device 16 and the NTSC input / output device 18. The analog image signal output from the switching device 22 is input to the monitor display device 23. The monitor display device 23 displays an image on the screen according to the input analog image signal.

This system handles two types of image data (HDTV NTSC) as described above. The HDTV image has a higher resolution than the NTSC image and is a high-definition image. When converting an image signal to digital data, in the case of an image based on the NTSC system, for example, 32
It is converted to image data consisting of pixel data of 0x250 pixels (80,000 pixels).
Converts to image data consisting of pixel data of 20 × 1024 pixels (about 2 million pixels). Since the image data of the HDTV system has a larger number of pixels, the data capacity becomes larger and it takes time to transfer the data.

Next, the multipoint control unit (MCU) 201
Will be described. As shown in FIG. 2, the MCU 201 is
It is composed of a CPU 31 and a storage device 33. CPU31
Is a transmission control unit 32 that controls transmission with other devices.
Is connected to Then, the command, high-definition digital image data, drawing data, and conference information sent from the image transmission device via the transmission control unit 32 are input. The input data can be stored in the storage device 33. The input data is the transmission control unit
It is transferred to another image transmission device via 32. In this way, the MCU 201 is connected to the connected image transmission device 110, 12
A process of transferring image data or the like sent from 0, 130 to an image transmission device other than the image transmission device of the transmission source is performed.

The operation of the image transmission system configured as described above will be described below. Now, consider a case where the image transmission devices 110, 120, and 130 are installed in separate facilities, and a multipoint conference is performed using this system. It is assumed that the sponsoring facility is a facility in which the image transmission device 110 is installed, and the facility participating in the conference is a facility in which the image transmissions 120 and 130 are installed. In addition, it is assumed that presenters (generally a plurality of presenters) at the conference are in a facility where the image transmission device 120 is installed (hereinafter, the facility where the image transmission device 120 is installed is referred to as a presentation facility).

The presenter is the image transmission device 120 at the presentation facility,
Register images (such as slide photos) used for the presentation in the system. That is, the HD in the image transmission device 120
The TV camera 17 captures an image used for the presentation.
The image signal from the HDTV camera 17 is converted into digital image data via the HDTV input / output device 17 and stored in the storage device 15. The stored image data is displayed on the display device 13 using a keyboard 14, a mouse or the like, and an operation of changing the order of registered images or erasing is performed.

The image data created in this way (that is, the material used in the conference, usually consisting of a plurality of image data) passes through the network line 2 via the transmission control unit 121, and transmits the image of the host facility. Sent to device 110. These image data can be sent in a batch, or if there is a correction after sending in a batch,
It is also possible to send only the data to be corrected and replace only the image data correction portion of the destination.

In the image transmission device 110 of the hosting facility, the image data, which is the material used in the conference and input through the transmission control unit 112, is stored in the storage device 15. Image data is sent from multiple presenters. Next, the image transmission device 110 of the host facility transfers the image data, which is the material used in the conference, to the participating facility. In this case, the image transmission device 13
Transfer to 0. The transferred image data is stored in the storage device 15 of the image transmission device 130.

After transferring the data, the conference is reserved. The conference reservation is made using the keyboard 14 of the image transmission device 110 of the host facility.
While checking the display device 13 using the mouse 25 and the mouse 25, the conference member, the conference start / end time, and the conference holding mode are set. The conference holding mode includes a free discussion mode and a lecture mode. By setting this mode, the multipoint control unit 201 determines a distribution route of information such as image data, a signal (display signal) for instructing display of an image, and drawing data. The conference holding mode will be described in detail later.

The conference reservation information is transferred from the image transmission device 110 of the host facility to the multipoint control unit 201 via the transmission control units 112 and 32.
The PU 31 stores these pieces of information in the storage device 33. The image transmission device 110 of the host facility can confirm the reservation status of the conference. The reservation confirmation request command is transferred from the image transmission device 110 of the host facility to the multipoint control unit 201 via the transmission control units 112 and 32 using the keyboard 14 and the mouse 25. The CPU 31 of the multipoint control unit is a storage device
The conference information is read from 33 and the transmission control units 32, 11
It is transferred to the CPU 12 of the image transmission device 110 of the sponsor facility via 2. The CPU 12 displays the conference information on the display device 13.

The above-mentioned work of transferring the image data to each point is performed before the conference starts. When starting a meeting, the image transmission device at each point is set to a predetermined setting so that communication can be performed on the network. The conference is held by the multipoint control unit 201. At the time of holding the conference, the CPU 31 uses the conference holding information on the network to attend the conference participating facilities 110, 120, 13
Connect 0.

The presenter at the presentation facility starts the presentation.
At the presentation facility, the keyboard 14 or the mouse 25 is operated according to the presenter's instruction to select the image to be displayed. The display order can be displayed in a preset order, or the order can be changed. At the presentation facility, the CPU 12 reads the data of the selected image from the storage device 15. At this time, the CPU 12 switches the output from the switching device 22 to the output side from the HDTV input / output device 16. The read image data is displayed on the monitor display device 23 via the HDTV input / output device 16 and the switching device 22.

Further, the CPU 12 outputs a display signal for displaying the selected image in order to display the selected image at multiple points. This display signal is sent to the multipoint control unit 201 via the transmission control units 122 and 32.
The multipoint control unit 201 sends it to the transmission control units 112 and 132 at other points via the transmission control unit 32 based on the connection information in the conference information stored in the storage device 33. The display signal sent to the transmission control units 112 and 132 is input to the image transmission device at each point. When the display signal is input, the CPU 12 reads out the image data indicated by the display signal from the storage device. The read image data is
It is sent to the monitor display device 23 via the HDTV input / output device 16 and the switching device 22. The image indicated by the display signal is a high-definition image on the monitor display device 23.
Will be displayed. Of course, at this time, the CPU 12 switches the output from the switching device 22 to the output side from the HDTV input / output device 16.

As described above, when the image to be displayed is switched at the presentation facility, the display at another facility is also switched to the same image. Since the amount of data contained in the display signal is much smaller than the image data for one high-definition image, the time required to send the display signal is very short compared to the time required to send the image data. . Therefore, when the display image is switched in the presentation facility, the image display is switched in real time at each point.

As described above, the presenter makes a presentation while switching the display of images. The presenter's voice is input from the microphone 21 of the presentation facility, sent as an audio signal to other points, reproduced at each point, and output from the speaker 20. The face of the presenter and the scene of the place of presentation can be found at the presentation facility NTS.
The image is taken by the C camera 19 and sent as image data to another point. This image data is converted into an analog image signal by the NTSC input / output device 18 at another point and output to the switching device 22. An image can be displayed on the monitor display device 23 by switching the output signal from the switching device 22.

The presenter is a mouse 25 or a tablet 26.
By using, it is possible to electronically write a figure or character such as a pointer (an arrow for indicating a desired position on the image), a straight line, a curved line, or a circle on the image displayed on the monitor display device 23. . The CPU 12 generates drawing data based on the input signal from the mouse 25 or the tablet 26. The drawing data is converted via the HDTV input / output device 16 and displayed on the monitor display device 23.

The drawing data generated by the image transmission device of the presentation facility is transmitted via the transmission control units 112 and 32.
It is sent to the multipoint control unit 201. Based on the connection information of the conference information, the multipoint control unit 201 transmits the transmission control units 112, 132 at other points via the transmission control unit 32.
Send to In the image transmission device of another facility, drawing data is input through the transmission control unit. The input drawing data is sent to the monitor display device 23 via the CPU 12, the HDTV input / output device 16, and the switching device 22, and is displayed. As described above, the figures and characters electronically drawn by the presenter at the presentation facility can be displayed on the monitor display devices of all the facilities. These shapes and letters,
It is also possible to display an image already displayed on the monitor display device in an overlapping manner. This can be used to point to a portion of the displayed image.

During the conference, questions and answers can be made from facilities other than the presentation facility. The question and answer may be performed by speaking into the microphone 21 at each point. The voice input from the microphone 21 is output from the speaker 20 of each facility. The operation at this time is similar to the operation when the voice from the above-mentioned presentation facility is sent to another facility. In the present embodiment, a so-called videophone system is formed by the microphone 21, the speaker 20, the NTSC camera 19, the monitor display device 23, and the NTSC input / output device 18.

At the time of question and answer during a meeting, it may be desired to display and explain an image other than the image sent to each point before the meeting. In this case, the NTSC camera 19 first images the material to be displayed. The image signal of the captured image is input to the NTSC input / output device 18. The NTSC input / output device 18 converts the input image signal into digital image data. This image data is sent to the image transmission device of another facility via the transmission control unit. Since the image data of NTSC has a small number of pixels and a small amount of data, the transfer time is short. The NTSC input / output device 18 outputs image data and then outputs a display signal for displaying the image. This signal is also transmitted via the transmission control unit.
It is sent to the multipoint control unit 201. The multipoint control unit 201 is sent to the image transmission device of another facility via the transmission control unit 32 based on the conference connection information.

Thereafter, the material photographed by the NTSC camera 19 as described above is photographed by the HDTV camera 17 this time.
The image signal of the captured image is sent to the HDTV input / output device 16 and converted into a digital image. This image data is C
It is sent to the image transmission device of another facility via the PU 12 and the transmission control unit. Since image data of HDTV has a large number of pixels and a large amount of data, it takes time to transfer. After outputting the image data, the CPU 12 outputs a display signal for displaying the image. This display signal is also sent to the image transmission device of another facility via the multipoint control unit 201.

As described above, the images of the respective materials may be picked up by the two cameras, but if the following is done, it is not necessary to pick up the images twice. A down-converting device is connected to the HDTV camera 17, and a signal from the HDTV camera 17 (HDTV system television signal) is converted into an NTSC system television signal and output to the NTSC input / output device 18. At the same time, the output signal from the HDTV camera 17 is HDTV.
The input / output device 16 may also be input. The subsequent operation is the same as the above case.

At other facilities, the image data for NTSC and the image data for HDTV will be sent successively. The image data for NTSC is transmitted by the transmission control unit 121.
(For image transmission device 120) to NTSC I / O device 18
Is input to The NTSC input / output device 18 converts the input image data into an analog image signal and outputs it to the switching device 22. The display signal for displaying the image for NTSC is the transmission control unit 122 (in the case of the image transmission device 120).
Is input to the CPU 12. When this display signal is input, the CPU 12 switches the output from the switching device 22 to the NTDC input / output device 18 side. As a result, the monitor display device 23 displays the image captured by the NTSC camera 19 at another point.

It takes a short time for an image captured by the NTSC camera at another point to be displayed on the monitor display device 23. Although image data for HDTV is sent after a display signal for displaying an image such as NTSC is sent, not all data arrives immediately because of the large amount of data. Meanwhile, by displaying an image by NTSC on the monitor display device 23,
Participants can see the outline of the image which is the material.

Image data for HDTV is input to the CPU 12 from the transmission control unit 122 (in the case of the image transmission device 120). When the input is completed, it is output to the HDTV input / output device 16. The HDTV input / output device 16 converts the input image data into an analog image signal and outputs it to the switching device 22.
A display signal for displaying an image for HDTV is sent from the transmission control unit 112 (in the case of the image transmission device 120) to the CPU.
Entered in 12. When this display signal is input, the CPU 12 outputs the output from the switching device 22 to the HDTV input / output device.
Switch to 16 side. As a result, monitor display device
The display of 23 is switched from the NTSC image that has been displayed until then to the HDTV screen.

The image switching, the display of figures and characters, and the image transmission described above were operations on the presentation facility side. In the present embodiment, when the same operation is possible in the image transmission device of the presentation facility or the facility other than the host facility, depending on the conference holding mode included in the reservation information of the conference set by the host facility before the conference is held. You may not be able to perform the same operation as. For example, if there is a free discussion, it is preferable that all facilities can make presentations and speak. In such a case, it is preferable that all operations can be similarly performed at all facilities. However, in the case of a lecture, if an operation can be performed from an image transmission device other than the image transmission device of the facility where the speaker is present, an operation contrary to the intention of the speaker may occur due to an erroneous operation of another facility during the lecture. May get in.

Therefore, in the present system, a free discussion mode in which the operation of the image transmission device of each facility is not limited at all and a lecture mode in which the operation can be performed only by the image transmission device of the host facility unless permitted by the host facility can be set. I did it. Since the operation in the free discussion mode is as described above, the operation in the lecture mode will be described. Consider a case where the facility having the image transmission device 120 is the sponsoring facility and the conference holding mode is the lecture mode. When issuing an image display command from the image transmission device 130, a display signal is input from the image transmission device 130 to the multipoint control unit 201 via the transmission control units 132 and 32. The multipoint control unit 201 determines whether the transmission source of the display signal is the image transmission device 120 of the host facility or the image transmission device of the facility that the host facility has allowed to operate. This display signal is ignored when the facility is neither the sponsor facility nor the facility where the operation is permitted. That is, when the image transmission device 130 is not the image transmission device of the facility where the operation is permitted, the transmitted display signal is ignored.
Similarly to the above, drawing data such as figures and character display signals, image data, and the like are ignored unless they are the sponsoring facility or a facility even authorized. This makes it possible to prevent operations from facilities other than the specified facility (the operation does not reflect the system).

Next, a method in which the sponsor facility gives an operation permission to another facility in the lecture mode will be described. When the image transmission device 120 in the host facility issues an operation permission to the image transmission device 130, the host facility selects the facility with the image transmission device 130 as the facility to permit the operation using the keyboard 14 or the mouse 25. The data of the device number of the selected image transmission device 130 is added with an operation permission command by the CPU 12 and is transmitted via the transmission control units 122 and 32 to the multipoint control unit 2
Sent to 01. The CPU 31 of the multipoint unit 201 determines whether the transfer source of this command is the image transmission device of the host facility. The conference reservation information sent from the host facility before the conference is held includes data on the participating members of the conference (that is, participating facilities). These data are stored in the storage device 33. If the operation permission command is sent from a facility other than the sponsoring facility, it is ignored. If it was sent from the host facility, the image transmission device specified in the reservation information
A speaking permission flag is added to the data part of 130 facilities.
When processing a signal sent from each transmission control device, the multipoint control unit 201 refers to the reservation information in the storage device 33 and determines whether the sender is the sponsoring facility or the facility for which speech is permitted. After that, the signal transmitted from the image transmission device 130 is accepted.

When the conference is ended, a signal indicating the end of the conference is sent from the image transmission device of the host facility to the multipoint control unit 20.
Sent to one. Then, the multipoint control unit 201 sends a signal indicating the end of the conference to the image transmission device of another facility. Then, in the image transmission device at each point, the setting that enables communication on the network is canceled.

[0044]

As described below, according to the present invention, a high-definition image can be viewed at each point at the same time. Further, it is possible to display figures and characters drawn at a remote place on a high-definition image, which makes it possible to give presentations at multiple points. As a result, it will be possible to smoothly hold multi-site research meetings and academic societies that were difficult to hold in the past.

Further, when the conference is used, it is possible to set facilities that can speak and facilities that cannot speak, so that various conference modes can be accommodated.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an image transmission device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an image transmission system according to an embodiment of the present invention.

[Explanation of symbols]

2; network line, 12; CPU, 13; display device, 14; keyboard, 15; storage device, 16; HDTV input / output device, 17; HDTV camera, 18; NTSC input / output device, 19; NTSC camera, 20; speaker , 21; Mike,
22; Switching device, 23; Monitor display device, 24; Frame memory, 25; Mouse, 26; Tablet, 31; CP
U, 33; storage device, 110, 120, 130, 140, 150, 160; image transmission device, 111, 112, 121, 122, 131, 132, 32; transmission control unit, 201; multipoint control unit (MCU) .

Claims (10)

[Claims] 1. A transmission in which a plurality of transmission devices capable of transmitting or receiving data and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices are network-connected. A system, wherein information about the plurality of connected transmission devices is set in at least one of the plurality of transmission devices;
A transmission system characterized in that the information is sent to the control unit. 2. The transmission system according to claim 1, wherein the information includes information indicating whether or not the control unit accepts data transmission from each transmission device. 3. The transmission system according to claim 1, wherein the control unit determines, based on the information, whether or not to accept the data transferred from the transmission device. 4. The transmission system according to claim 3, wherein the data is image data, data for instructing display of an image, or drawing data. 5. A transmission in which a plurality of transmission devices capable of transmitting or receiving data and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices are network-connected. In the system, the transmission device includes image input means for inputting image data, image transfer means for transferring a plurality of the image data from the image input means, and a plurality of the image data for transfer from the image transfer means. Display instruction means for outputting an instruction signal for displaying at least one of the plurality of image data, and at least one of the plurality of image transmission devices is connected. A transmission system comprising: setting means for setting information regarding the plurality of transmission devices that are present, and transmitting the information to the control unit. 6. A transmission in which a plurality of transmission devices capable of transmitting or receiving data and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices are network-connected. In the system, at least one of the plurality of transmission devices has setting means for setting information regarding the plurality of connected transmission devices, and sending the information to the control unit. Has a storage unit for storing the sent information, and at least one of the plurality of image transmission devices has a unit for requesting the control unit to return the information, and the returned unit. A transmission system comprising means for displaying information. 7. A transmission in which a plurality of transmission devices capable of transmitting or receiving data and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices are network-connected. In the system, at least one of the plurality of transmission devices has setting means for setting information regarding the plurality of connected transmission devices, and sending the information to the control unit. The transmission system receives image data or drawing data transferred from the transmission device, and transfers the image data or drawing data to another transmission device based on the information. 8. A transmission in which a plurality of transmission devices capable of transmitting or receiving data and a control unit which is connected to the plurality of transmission devices and manages data transmission between the plurality of transmission devices are network-connected. In the system, the transmission device includes an image transfer unit that transfers a plurality of the image data, and at least one of the plurality of image data after transferring the plurality of image data from the image transfer unit. Display instruction means for outputting an instruction signal for displaying, and drawing data transfer means for creating and transferring drawing data, wherein at least one of the plurality of transmission devices is connected to the plurality of connected devices. Of the image data transmitted from the transmission device. The control unit has setting means for setting the information regarding the transmission device and transmitting the information to the control unit. There receives drawing data or instruction signals,
A transmission system, wherein the image data or the drawing data is transferred to another transmission device based on the information. 9. The transmission system according to claim 8, wherein the control unit determines, based on the information, whether to accept the transferred image data or drawing data or an instruction signal. 10. The control unit, based on the information, determines whether to transfer the transferred image data or drawing data or an instruction signal to all of the transmission devices or to a specific transmission device. The transmission system according to claim 8, wherein the transmission system is determined.