JP2020095705A - Communication management system, communication system, communication method, and program - Google Patents

Abstract

To solve the problem in which: a data amount of image data of a material image of a material displayed on a display of a communication terminal, such as an electronic blackboard, is much larger than a data amount of stroke data for reproducing a stroke image that is drawn by a user bringing an electronic pen into contact with the display and moving the electronic pen; and therefore, when an electronic blackboard 1a transmits the image data and stroke data to an electronic blackboard 1b, the electronic blackboard 1b may receive the stroke data earlier than the image data, and the electronic blackboard 1b displays the material image after displaying the stroke image, which hinders smooth communication.SOLUTION: A communication management system 5 receives a notification to start uploading from an electronic blackboard 1a that uploads image data (S105), and transmits the start notification to the electronic blackboard 1b (S106). The electronic blackboard 1b displays an icon of a sandglass indicating a fact that the same downloads image data of a material image (S107).SELECTED DRAWING: Figure 15

Description

The present invention relates to a communication management system, a communication system, a communication method, and a program.

A communication system that communicates with a remote place via a communication network such as the Internet has become widespread. An example of the communication system is a conference system for holding a remote conference. In a general conference system, a communication terminal used by one of parties involved in a remote conference converts an image or sound of a subject in a conference room into digital data and transmits the digital data to a communication terminal used by the other party. Next, the communication terminal used by the other of the parties displays an image on the display and outputs a sound from the speaker. As a result, it is possible to hold a conference between remote places in a state close to an actual conference. Furthermore, it is possible to share image data by transmitting image data showing a material or the like held or displayed on one communication terminal side to the other communication terminal via a communication network (Patent Document 1). reference).

Also, at a meeting or the like in a company, an educational institution, an administrative institution, etc., a communication terminal such as an electronic blackboard on which an image is displayed on a display and a user draws a stroke image such as letters, numbers and figures on the image. It is used (see Patent Document 2). This stroke image is drawn by electronically converting the content drawn by the user touching and moving the display on the display with an electronic pen or hand by the user to generate stroke data such as coordinate data. It Furthermore, when a stroke image is drawn on one communication terminal, the stroke data for reproducing this stroke image is transmitted to the other communication terminal via the communication network, so that the same stroke image is also displayed on the other communication terminal. Is displayed.

As described above, one communication terminal (first communication terminal) transmits the image data of the material or the like being displayed or stored and the stroke data for reproducing the stroke image to the other communication terminal via the communication network. By transmitting to the (second communication terminal), the other communication terminal can display a material image such as a material or a screen background and a stroke image.

However, in recent years, the volume of image data such as materials has become very large due to the sophistication of applications. For example, since the data amount of the image data of the material image is much larger than the data amount of the stroke data for reproducing the stroke image, the timing of the image data and the stroke data reaching the second communication terminal does not match. That is, in the second communication terminal, the stroke data may arrive before the image data of the material image. In such a case, the second communication terminal displays the material image after the stroke image is displayed. To be done. As a result, the user of the second communication terminal notices the existence of the material image after the stroke image is displayed, which causes a problem in smooth communication with the user of the first communication terminal. Occurs.

The invention according to claim 1 is a communication management system that manages data sharing in a plurality of communication terminals, and transmits so that the first communication terminal receives storage location information indicating a storage location of image data. And a receiving unit that receives a start notification transmitted by the first communication terminal and indicating that the uploading of the image data is to be started, and the transmitting unit is received by the second communication terminal. As described above, the start notification is transmitted, the receiving unit receives the stroke data for reproducing the stroke image transmitted by the first communication terminal, and the transmitting unit receives the stroke data by the second communication terminal. So as to transmit the stroke data.

As described above, according to the present invention, by properly sharing the material image and the stroke image between the user of the first communication terminal and the user of the second communication terminal, It is possible to contribute to various communication.

It is the schematic which showed the communication route of this embodiment. It is a usage image figure of an electronic blackboard. It is a hardware block diagram of the electronic blackboard which concerns on this embodiment. FIG. 3 is a hardware configuration diagram of a communication management system, a relay device, and an image storage device according to the present embodiment. It is the whole communication system lineblock diagram concerning this embodiment. It is each functional block diagram of the communication system concerning this embodiment. It is a conceptual diagram which shows an authentication management table. It is a conceptual diagram which shows a terminal management table. It is a conceptual diagram which shows a destination list management table. It is a conceptual diagram which shows a session management table. It is a conceptual diagram which shows a relay device management table. It is a sequence diagram showing processing of a preparatory stage which starts remote communication between electronic blackboards. It is a screen example of a destination list displayed on the electronic blackboard 1a. It is a sequence diagram showing a process of starting remote communication. FIG. 8 is a sequence diagram showing a process of sharing image data of a material image and stroke data of a stroke image. FIG. 8 is a sequence diagram showing a process of sharing image data of a material image and stroke data of a stroke image. It is a figure which shows the screen example of (a) electronic whiteboard 1a, the screen example of (b) electronic blackboard 1b, the screen example of (c) electronic blackboard 1a, and the screen example of (d) electronic blackboard 1b.

An embodiment of the present invention will be described below with reference to the drawings.

[Outline of communication system]
<Communication route>
First, a communication system for conducting a video conference while drawing between a plurality of electronic blackboards 1b, 1b will be described with reference to FIG. FIG. 1 is a schematic diagram showing a communication route of this embodiment. In some cases, the term “video conference” is used instead of “video conference”. Although a video conference will be described here as an example, a meeting or a simple conversation may be performed.

The communication system is constructed by a plurality of electronic blackboards 1 a and 1 b, a relay device 3, a communication management system 5, and an image storage device 7. The electronic blackboards 1a and 1b perform mutual communication of content data such as video data and sound data for calls, and image data and stroke data for sharing. The stroke data is data required to reproduce (reproduce) the stroke image, and includes coordinate data, line width data, line color data, vector data, and the like. The electronic blackboards 1a and 1b can transmit and receive video data and sound data for a call to reproduce the video and sound of the other party, thereby enabling a remote video call.

The electronic blackboards 1a and 1b can transmit/receive image data of a material image for sharing, so that participants using the communication system can share the same material image. The material image is an image displayed on the display of the electronic blackboard 1, and is an image of the material of the conference, a background image displayed on the display, a capture screen when the display screen is captured, or the like. Further, the electronic blackboards 1a and 1b transmit/receive the stroke data of the stroke image for sharing, so that the participants who use the communication system can share the same stroke image. The stroke image is an image showing a line or the like drawn by a user with a handwritten stroke with an electronic pen or the like. The stroke image is displayed by the stroke data indicating the point that specifies the coordinates on the display.

The communication system is not limited to the two electronic blackboards 1a and 1b, and may be constructed by three or more electronic blackboards. Hereinafter, the electronic blackboards 1b and 1b are collectively referred to as "electronic blackboard 1".

In FIG. 1, an electronic blackboard having a video conference function is shown as an example of the electronic blackboards 1a and 1b. The image of the video data may be a moving image or a still image.

Further, the electronic blackboard as a request source for requesting the start of the video conference is represented as "starting terminal", and the electronic blackboard as a destination (relay destination) as the request destination is represented as "destination terminal". In FIG. 1, the electronic blackboard 1a is shown as a start terminal and the electronic blackboard 1b is shown as a destination terminal. However, when requesting the start of the video conference from the electronic blackboard 1b, the electronic blackboard 1b becomes the start terminal and the electronic blackboard 1a becomes the destination terminal. The electronic blackboards 1b and 1b are used not only for communication between a plurality of business establishments and communication between different rooms in the same business establishment, but also for communication in the same room, outdoors and indoors or outdoors and outdoors. May be used in communication.

The relay device 3 is composed of a computer and performs a process of relaying content data for a call between the plurality of electronic blackboards 1b and 1b.

The communication management system 5 is configured by a computer, and centrally manages login authentication from the electronic blackboards 1b and 1b, management of communication statuses of the electronic blackboards 1b and 1b, management of destination list, communication status of the relay device 3, and the like. To do. Further, the communication management system 5 relays the stroke data for sharing between the plurality of electronic blackboards 1b, 1b.

The image storage device 7 is configured by a computer, stores image data of a material image for sharing uploaded from the electronic blackboard 1a, and downloads it to the electronic blackboard 1b. The reverse is also done. That is, the image storage device 7 stores the image data uploaded from the electronic blackboard 1b and downloads it to the electronic blackboard 1a.

The relay device 3, the communication management system 5, and the image storage device 7 may be constructed by a single computer, or may be constructed by a plurality of computers that are arbitrarily assigned by dividing each unit (function or means). May be.

In the communication system, a management information session sei for transmitting and receiving various kinds of management information is established between the electronic blackboards 1a and 1b via the communication management system 5. In addition, for transmitting and receiving each of four data of high-resolution image data, medium-resolution image data, low-resolution image data, and sound data to and from the electronic blackboards 1a and 1b via the relay device 3. Four sessions are established. In FIG. 1, these four sessions are collectively shown as an image/sound data session sed. Note that the image/sound data session sed does not necessarily have to be four sessions, and may have a session number smaller or larger than four sessions. Further, a communication session may be directly established between the start terminal and the destination terminal without going through the relay device 3.

Furthermore, in the communication system, stroke data can be transmitted and received between the electronic blackboards 1a and 1b by using the management information session sei.

Here, the resolution of the video of the video data handled in this embodiment will be described. The low-resolution video data includes, for example, 160 pixels horizontally and 120 pixels vertically, and serves as a base image. The video data of medium resolution consists of 320 pixels horizontally and 240 pixels vertically. The high-resolution video data includes, for example, 640 pixels in the horizontal direction and 480 pixels in the vertical direction. Of these, when passing through a narrow band path, low-quality video data consisting only of low-resolution video data that serves as a base image is relayed. When the band is relatively wide, low-resolution video data serving as a base image and medium-quality video data including medium-resolution video data are relayed. When the band is extremely wide, high-quality video data including low-resolution video data, medium-resolution video data, and high-resolution video data, which are base images, is relayed. Since the amount of sound data is smaller than that of video data, it is relayed even through a narrow band route.

<Image of using the electronic blackboard>
FIG. 2 is an image diagram of the use of the electronic blackboard. As shown in FIG. 2, the electronic blackboard 1 includes a leg 151 provided with a plurality of casters on a lower side thereof, a post 152 provided on an upper side of the leg 151, and an upper part of the post 152. It is configured by a main body 153 of the electronic blackboard 1 provided on the side and a display 180 provided on the front surface of the main body 153. The main body 153 has a CPU 101 and the like described later built therein. Then, the user can use the electronic pen 160 to input (draw) a stroke image such as a character on the display 180.

[Hardware configuration]
Next, the hardware configuration of this embodiment will be described.

<Hardware configuration of electronic blackboard>
FIG. 3 is a hardware configuration diagram of the electronic blackboard. As shown in FIG. 3, the electronic blackboard 1 includes a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, an SSD (Solid State Drive) 104, and a network I/O. An F 105 and an external device connection I/F (Interface) 106 are provided.

Of these, the CPU 101 controls the operation of the entire electronic blackboard 1. The ROM 102 stores programs used for driving the CPU 101 such as the CPU 101 and IPL (Initial Program Loader). The RAM 103 is used as a work area for the CPU 101. The SSD 104 stores various data such as a program for an electronic blackboard. The network controller 105 controls communication with the communication network 100. The external device connection I/F 106 is an interface for connecting various external devices. The external devices in this case are, for example, a USB (Universal Serial Bus) memory 130 and external devices (microphone 140, speaker 150, camera 160).

The electronic blackboard 1 also includes a capture device 111, a GPU 112, a display controller 113, a contact sensor 114, a sensor controller 115, an electronic pen controller 116, a short-range communication circuit 119, and an antenna 119a of the short-range communication circuit 119, a power switch 122, and A selection switch 123 is provided.

Of these, the capture device 111 causes the display of an external PC (Personal Computer) 170 to display video information as a still image or a moving image. A GPU (Graphics Processing Unit) 112 is a semiconductor chip that specializes in graphics. The display controller 113 controls and manages screen display in order to output the output image from the GPU 112 to the display 180 or the like. The contact sensor 114 detects that the electronic pen 190, the user's hand H, or the like has come into contact with the display 180. The sensor controller 115 controls processing of the contact sensor 114. The contact sensor 114 performs input of coordinates and detection of coordinates by an infrared ray blocking method. The method of inputting the coordinates and detecting the coordinates is such that two light emitting/receiving devices installed at both upper ends of the display 180 emit a plurality of infrared rays in parallel with the display 180 and are provided around the display 180. This is a method of receiving the light reflected by the reflecting member and returning on the same optical path as the optical path of the light emitted by the light receiving element. The contact sensor 114 outputs the ID of infrared rays emitted by the two light emitting/receiving devices blocked by the object to the sensor controller 115, and the sensor controller 115 specifies the coordinate position which is the contact position of the object. The electronic pen controller 116 communicates with the electronic pen 190 to determine whether or not the tip of the pen or the touch of the pen bottom touches the display 180. The short-range communication circuit 119 is a communication circuit such as NFC (Near Field Communication) and Bluetooth (registered trademark). The power switch 122 is a switch for switching ON/OFF the power of the electronic blackboard 1. The selection switches 123 are, for example, a group of switches for adjusting the brightness and shade of the display on the display 180 and the like.

Further, the electronic blackboard 1 includes a bus line 110. The bus line 110 is an address bus, a data bus, or the like for electrically connecting the respective constituent elements such as the CPU 101 shown in FIG.

Note that the contact sensor 114 is not limited to the infrared blocking method, but is a capacitive touch panel that detects a change in electrostatic capacity to specify a contact position, and a contact position is specified by a voltage change between two opposing resistance films. Various detection means such as a resistive film type touch panel, an electromagnetic induction type touch panel that detects electromagnetic induction generated when a contact object touches the display unit, and specifies a contact position may be used. Further, the electronic pen controller 116 may determine whether or not the user holds the part of the electronic pen 190 or other parts of the electronic pen 190 as well as the pen tip and pen bottom of the electronic pen 190.

<Hardware configuration of communication management system, relay device, and image storage device>
FIG. 4 is a hardware configuration diagram of the communication management system 5 according to the present embodiment. A computer as an example of the communication management system 5 includes a CPU 501, a ROM 502, a RAM 503, an HD (Hard Disk) 504, an HDD (Hard Disk Drive) controller 505, a display 506, an external device connection I/F (Interface) 508, and a network I/F. An F509, a keyboard 511, a pointing device 512, a DVD-RW (Digital Versatile Disk ReWritable) drive 514, a media I/F 516, and a bus line 510 are provided.

Of these, the CPU 501 controls the operation of the entire communication management system 5. The ROM 502 stores a program used for driving the CPU 501 such as an IPL. The RAM 503 is used as a work area for the CPU 501. The HD 504 stores various data such as a communication management program. The HDD controller 505 controls reading or writing of various data with respect to the HD 504 under the control of the CPU 501. The display 506 displays various information such as a cursor, a menu, a window, characters, and an image. The external device connection I/F 508 is an interface for connecting various external devices. The network I/F 509 is an interface for performing data communication using the communication network 4 such as the Internet. The keyboard 511 is a type of input means including a plurality of keys for inputting characters, numerical values, various instructions, and the like. The pointing device 12 is a type of input means for selecting and executing various instructions, selecting a processing target, moving a cursor, and the like. The DVD-RW drive 514 controls reading or writing (storage) of data with respect to the DVD-RW. Note that reading or writing (storage) of data to a disc such as a BD-RE (Blu-ray Disc Rewritable) instead of the DVD-RW drive may be controlled. The media I/F 516 controls reading or writing (storage) of data with respect to the recording medium 515 such as a flash memory.

Further, the bus line 510 is an address bus, a data bus or the like for electrically connecting the respective components such as the CPU 501 shown in FIG.

Note that the hardware configurations of the relay device 3 and the image storage device 7 illustrated in FIG. 1 are similar to the hardware configurations of the communication management system 5, and thus description thereof will be omitted. However, in the case of the relay device 3, the relay program is stored in the HD 504. Further, in the case of the image storage device 7, the image storage program is stored in the HD 504.

[Overall configuration of communication system]
Next, the overall configuration of the communication system will be described with reference to FIG. FIG. 5 is an overall configuration diagram of the communication system according to the embodiment of the present invention.

In FIG. 5, the electronic blackboard 1a is installed at the site A, and the electronic blackboard 1b is installed at the site B. For example, the base A is the Tokyo office in Japan, and the base B is the Osaka office in Japan. At the base A, the user A1 uses the electronic blackboard 1a, and at the base B, the users B1 and B2 use the electronic blackboard 1b.

Further, the electronic blackboards 1a and 1b, the relay device 3, the communication management system 5, and the image storage device 7 can perform mutual data communication via a communication network 100 such as the Internet. The communication network 100 may include a wireless communication part.

In FIG. 5, the electronic blackboards 1a and 1b are both electronic blackboards capable of video communication.

[Functional configuration of communication system]
Next, the functional configuration of this embodiment will be described with reference to FIGS. 6 to 11. FIG. 6 is a functional block diagram of the communication system according to the present embodiment.

<Functional configuration of electronic blackboard 1a>
As shown in FIG. 6, the electronic blackboard 1a includes a transmission/reception unit 11a, a reception unit 12a, a video/sound processing unit 13a, a display control unit 14a, a determination unit 15a, an image processing unit 17a, and a short-range communication unit 18a. And a storage/readout processing unit 19a. Each of these units is a function realized by any one of the constituent elements shown in FIG. 2 being operated by an instruction from the CPU 101 according to a program expanded on the RAM 103 from the SSD 104, or means for functioning. is there. Further, the electronic blackboard 1a has a RAM 103 shown in FIG. 2 and a storage unit 1000a constructed by the flash memory 104 shown in FIG.

(Each functional configuration of the electronic blackboard 1a)
Next, each component of the electronic blackboard 1a will be described. The transmission/reception unit 11a transmits/receives various data (or information) to/from another terminal, device, or system via the communication network 100. The transmitter/receiver 11a also functions as a starter and performs a process of starting communication with another communication terminal such as the electronic blackboard 1b. The reception unit 12a receives various inputs from the user using the electronic pen 190 or the like.

The video/sound processing unit 13a performs the main processing of the video conference function. For example, the video/sound processing unit 13a performs digital processing such as encoding of video data and sound data in accordance with the output signal of the microphone 140 and the output signal of the camera 160. The video/sound processing unit 13a also generates a video signal or a sound signal based on the video data and the sound data received by the transmitting/receiving unit 11a. The video/sound processing unit 13a performs a process of combining video data having different resolutions.

The display control unit 14a performs control for outputting a video signal (image signal) or the like to the display 180. The judgment unit 15a makes various judgments.

The image processing unit 17a performs main processing of the electronic blackboard function. For example, the image processing unit 17a creates a stroke image and stroke data based on the stroke of the electronic pen 190 or the like accepted by the accepting unit 12a, or creates a stroke image based on the stroke data received by the transmitting/receiving unit 11a. To do The image processing unit 17a also generates an image signal based on the image data of the material image received by the transmitting/receiving unit 11a.

The short-range communication unit 18a acquires and provides data by short-range wireless communication with each terminal having the short-range communication unit.

The storage/read processing unit 19a performs processing of storing various data in the storage unit 1000a or the recording medium 1010a such as the USB memory 130, or reading various data stored in the storage unit 1000a or the recording medium 1010a.

Further, in the storage unit 1000a, video data and sound data received when communicating with another terminal is overwritten and stored each time it is received. Of these, an image is displayed on the display 180 by the video data before being overwritten, and a sound is output from the speaker 150 by the sound data before being overwritten.

<Functional configuration of electronic blackboard 1b>
As shown in FIG. 6, the electronic blackboard 1b includes a transmission/reception unit 11b, a reception unit 12b, a video/sound processing unit 13b, a display control unit 14b, a determination unit 15b, an image processing unit 17b, a short-range communication unit 18b, And a storage/readout processing unit 19b. The transmission/reception unit 11b, the reception unit 12b, the video/sound processing unit 13b, the display control unit 14b, the determination unit 15b, the image processing unit 17b, the short-range communication unit 18b, and the storage/readout processing unit 19b are respectively the transmission/reception unit 11a, Since the reception unit 12a, the video/sound processing unit 13a, the display control unit 14a, the determination unit 15a, the image processing unit 17a, the short-range communication unit 18a, and the storage/readout processing unit 19a have the same functions, Is omitted.

<Functional configuration of relay device>
As shown in FIG. 6, the relay device 3 includes a transmission/reception unit 31, which also serves as a transfer unit, a determination unit 35, and a storage/readout processing unit 39. Each of these units is a function realized by any one of the constituent elements shown in FIG. 4 or a function that is realized by operating by a command from the CPU 501 according to a relay program expanded from the HD 504 on the RAM 503. Is. Further, the relay device 3 has a storage unit 3000 constructed by the RAM 503 and the HD 504 shown in FIG.

(Functional configuration of relay device)
Next, each functional configuration of the relay device 3 will be described in detail. The transmission/reception unit 31 of the relay device 3 illustrated in FIG. 6 transmits/receives various data (or information) to/from another terminal, device, or system via the communication network 100. The transmission/reception unit 31 also functions as a transfer unit, and transfers the video data and sound data transmitted from a predetermined terminal to another terminal. The judgment unit 35 makes various judgments such as judgment of a data delay state.

The storage/readout processing unit 39 performs processing of storing various data in the storage unit 3000 and reading out various data stored in the storage unit 3000.

<Functional configuration of communication management system>
As shown in FIG. 6, the communication management system 5 includes a transmission/reception unit 51, an authentication unit 52, a generation unit 53, a selection unit 54, a determination unit 55, and a storage/readout processing unit 59. Each of these units functions or functions realized by any of the components shown in FIG. 6 being operated by an instruction from the CPU 501 according to a communication management program expanded from the HD 504 on the RAM 503. It is a means. Further, the communication management system 5 has a storage unit 5000 constructed by the HD 504 shown in FIG.

(Authentication management table)
FIG. 7 is a conceptual diagram showing an authentication management table. An authentication management DB 5001 including an authentication management table as shown in FIG. 7 is built in the storage unit 5000. In this authentication management table, each password is associated with each terminal ID of all the electronic blackboards 1 managed by the communication management system 5 and managed. For example, the authentication management table shown in FIG. 7 indicates that the terminal ID of the electronic blackboard 1a (communication terminal) is "01aa" and the password is "aaaa". The password is an example of authentication information, and the authentication information also includes an access token.

(Terminal management table)
FIG. 8 is a conceptual diagram showing a terminal management table. In the storage unit 5000, a terminal management DB 5002 configured by a terminal management table as shown in FIG. 8 is constructed. In this terminal management table, for each terminal ID for identifying each electronic blackboard 1 (communication terminal), the destination name when each electronic blackboard 1 is the destination, the operating state of each electronic blackboard 1, and the login request information described below. The reception date and time when is received by the communication management system 5 and the IP address of each electronic blackboard 1 (communication terminal) are associated and managed. For example, in the terminal management table shown in FIG. 8, the electronic blackboard 1a with the terminal ID “01aa” has the terminal name “Japan Tokyo Office AA terminal” and the operating state “ON line (communicable)”. Then, the date and time when the login request information is received by the communication management system 5 is "13:40 on April 10, 2015", and the IP address of this terminal 1aa is "1.2.1.3". It is shown. The terminal ID, the destination name, and the IP address of the terminal are stored when each electronic blackboard 1 is pre-registered in order to receive the service provided by the communication management system 5.

(Recipient list management table)
FIG. 9 is a conceptual diagram showing the destination list management table. A destination list management DB 5003 configured by a destination list management table as shown in FIG. 9 is built in the storage unit 5000. In this destination list management table, all the terminal IDs of the destination terminals registered as candidates for the electronic whiteboard 1 (destination terminal) are associated with the terminal IDs of the electronic whiteboard 1 (starting terminal) requesting the start of communication. Managed. For example, in the destination list management table shown in FIG. 9, the destination terminal candidates that can request the start of communication from the starting terminal (electronic whiteboard 1a) with the terminal ID “01aa” have the terminal ID “ It is shown that it is the electronic blackboard 1b of "01ba". This destination terminal candidate is updated by being added or deleted in response to a request for addition or deletion from the arbitrary management terminal to the communication management system 5.

Note that the destination list is an example of the destination information, and the destination information may not be in a list format, but information about the destination such as the terminal ID may be listed.

(Session management table)
FIG. 10 is a conceptual diagram showing a session management table. A session management DB 5004 configured by a session management table as shown in FIG. 10 is built in the storage unit 5000. In the session management table, the relay device ID of the relay device 3 used for each communication session ID for identifying a session for mutual communication between each electronic blackboard (communication terminal) and the relay device 3, The terminal ID of the electronic blackboard 1 (starting terminal), the terminal ID of the electronic blackboard 1 (destination terminal), the delay time (ms) of reception when video data is received at the destination terminal, and this delay time are shown. The reception date and time, which is sent from the destination terminal and is received by the communication management system 5, is associated and managed. For example, in the session management table shown in FIG. 10, in the communication session executed using the session ID “se01”, the relay device (relay device ID “111a”) is the electronic blackboard with the terminal ID “01aa”. And the image data and the sound data are relayed between the electronic blackboard with the terminal ID "01db" and the image at the time "13:41 on April 10, 2015" on the electronic blackboard (destination terminal). It is shown that the data delay time is 200 (ms).

(Relay device management table)
FIG. 11 is a conceptual diagram showing a relay device management table. In the storage unit 5000, a relay device management DB 5005 configured by a relay device management table as shown in FIG. 11 is constructed. In this relay device management table, for each relay device ID, the operating state of each relay device 3, the reception date and time when the communication management system 5 received the state information indicating the operating state, the IP address of the relay device 3, and the relay The maximum data transmission rate (Mbps) in the device 3 is associated and managed. For example, in the relay device management table shown in FIG. 11, the relay device 3 having the relay device ID “111a” has the operating state “ON line”, and the date and time when the communication management system 5 receives the state information. At “13:30 on April 10, 2014”, it is shown that the IP address of the relay device 3 is “1.2.1.2” and the maximum data transmission rate in the relay device 3 is 100 Mbps. Has been done.

(Functional configuration of communication management system)
The transmission/reception unit 51 of the communication management system 5 shown in FIG. 6 transmits/receives various data (or information) to/from another terminal, device, or system via the communication network 100.

The authentication unit 52 uses the terminal ID and password included in the login request received via the transmission/reception unit 51 as a search key, searches the authentication management DB 5001 of the storage unit 5000, and sets the same group of terminals in the authentication management DB 5001. Authentication is performed by determining whether the ID and password are managed. The generation unit 53 generates a session ID for identifying a communication session based on the communication start request (see S62) from the electronic blackboard 1. The selection unit 54 performs a process of finally selecting one relay device 3 from the plurality of relay devices 3. The judgment unit 54 makes various judgments. The storage/readout processing unit 59 performs processing of storing various data in the storage unit 5000 and reading out various data stored in the storage unit 5000.

<Functional configuration of image storage device>
As shown in FIG. 6, the image storage device 7 includes a transmission/reception unit 71 and a storage/readout processing unit 79. Each of these units functions or functions realized by any of the components shown in FIG. 6 being operated by an instruction from the CPU 501 according to an image storage program expanded from the HD 504 on the RAM 503. It is a means. The image storage device 7 also has a storage unit 7000 constructed by the RAM 503 and HD 504 shown in FIG.

(Functional configuration of image storage device)
Next, each functional configuration of the image storage device 7 will be described in detail. The transmission/reception unit 71 of the image storage device 7 shown in FIG. 6 transmits/receives various data (or information) to/from another terminal, device, or system via the communication network 100. The storage/readout processing unit 79 performs processing of storing various data in the storage unit 7000 and reading out various data stored in the storage unit 7000.

[Process or Operation of Embodiment]
Next, processing or operation in the communication system according to the present embodiment will be described with reference to FIGS. 12 to 17.

<Processing at the preparation stage for remote communication>
First, the preparation process for communication performed by the electronic blackboard 1a as the login request terminal will be described with reference to FIGS. 12 and 13. It should be noted that FIG. 12 is a sequence diagram showing the processing in the preparatory stage for starting remote communication between the electronic blackboards. FIG. 13 is an example of a screen of the destination list displayed on the electronic blackboard 1a. Note that the process of the electronic blackboard 1b performing login sharing is the same as the process of the electronic blackboard 1a, and a description thereof will be omitted.

First, when the power switch 122 is turned on in the electronic whiteboard 1a, the reception unit 12a receives the power ON (step S22).

Next, the transmission/reception unit 11a transmits login request information indicating a request for login authentication to the communication management system 5 via the communication network 100 (step S23). This login request information includes the terminal ID of the electronic blackboard 1a and the password.

Next, the authentication unit 52 of the communication management system 5 searches the authentication management table (see FIG. 7) using the terminal ID and password included in the login request information received via the transmission/reception unit 51 as a search key, The terminal is authenticated by determining whether the same terminal ID and the same password are managed (step S24). Here, description will be continued assuming that the same terminal ID and the same password are managed by the storage/read processing unit 59.

When the authentication unit 52 determines that the same terminal ID and the same password are managed, and the login request is from a terminal having a valid usage authority, the storage/read processing unit 59 In the terminal management table (see FIG. 8), the field part of the operating state of the record of the terminal ID received in step S23 is changed to “ON line (communication possible)”, and the field part of the reception date and time is set in step S23. The date and time when the login request information is received is stored (step S25). As a result, in the terminal management table, the terminal ID “01aa”, the operating state “online (communication possible)”, the reception date and time “2015.4.10.13:40”, and the IP address “1.2.1.3”. Will be managed in association with each other. The IP address of the terminal may not be registered in advance, but may be transmitted from the electronic blackboard 1a in step S23.

Next, the storage/read processing unit 59 adds and manages a new record including the terminal ID of the electronic blackboard 1a received in step S23 in the session management table (see FIG. 10) (step S26). Then, the transmission/reception unit 51 of the communication management system 5 transmits the authentication result information indicating the authentication result obtained by the process of step 24 to the electronic blackboard 1a that has made the login request via the communication network 100. (Step S27).

When the transmission/reception unit 11a of the login request terminal (electronic blackboard 1a) receives the authentication result information indicating the result of the determination that the terminal has the proper usage authority, the transmission/reception unit 11a communicates via the communication network 100. The destination list request information indicating that the destination list is requested is transmitted to the management system 5 (step S28). As a result, the transmission/reception unit 51 of the communication management system 5 receives the destination list request information.

Next, the storage/reading processing unit 59 searches the destination list management table (see FIG. 9) using the terminal ID “01aa” of the login request terminal (electronic blackboard 1a) as a search key, and the login request terminal (electronic blackboard 1a). ) Is read out and the destination name corresponding to this terminal ID is read out from the terminal management table (see FIG. 8) (step S29). Here, each terminal ID of the destination candidates corresponding to the terminal ID “01aa” of the login request terminal (electronic blackboard 1a) and the destination name corresponding to these are extracted.

Next, the transmission/reception unit 51 of the communication management system 5 reads out the data of the destination list frame and the data of the icon indicating the operating state from the storage unit 5000 via the storage/readout processing unit 59 (step S30), and at the same time, the destination list. The “request list information (destination list frame, icon, terminal ID, destination name)” including the frame and the icon, and the terminal ID and the destination name read by the storage/read processing unit 59 are stored in the login request terminal (electronic blackboard). 1a) (step S31). As a result, in the login request terminal (electronic blackboard 1a), the transmission/reception unit 11a receives the destination list information, and the storage/read processing unit 19a stores the destination list information in the storage unit 1000a (step S32). As described above, in the present embodiment, instead of managing the destination list information in each terminal, the communication management system 5 centrally manages the destination list information of all the terminals. Therefore, new electronic blackboards will be included in the communication system, new models of terminals will be included in place of the terminals already included, and the appearance of the destination list frame will be changed. Even in such a case, the communication management system 5 side can handle all at once, so that it is possible to save the trouble of changing the destination list information on each terminal side.

Further, the storage/read processing unit 59 of the communication management system 5 searches the terminal management table (see FIG. 8) using the terminal ID of the read destination candidate described above as a search key, and operates corresponding to each terminal ID. By reading the status, each operating status of the electronic blackboard as a destination candidate is acquired (step S33).

Next, the transmission/reception unit 51 transmits “terminal state information” including the terminal ID as the search key used in step S33 and the operating state of each corresponding destination terminal via the communication network 100. It transmits to the login request terminal (electronic blackboard 1a) (step S34).

Next, the storage/readout processing unit 19a of the login shared terminal (electronic blackboard 1a) sequentially stores the terminal status information received from the communication management system 5 in the storage unit 1000a (step S35). Therefore, the login request terminal (electronic blackboard 1a) receives the status information of each of the electronic blackboards described above, so that the login request terminal (electronic blackboard 1a) can communicate with the login request terminal (electronic blackboard 1a) such as the current candidate of the electronic blackboard 1b. Each operating status can be acquired.

Next, the display control unit 14a of the login request terminal (electronic blackboard 1a) reflects the state of the terminal as a destination candidate based on the destination list information stored in the storage unit 1000a and the state information of the terminal. While creating the destination list, the display control unit 14a displays the destination list screen 1100 shown in FIG. 13 on the display 180 of the electronic blackboard 1a (step S36). On this destination list screen 1100, an icon indicating the operating state, a terminal ID, and a destination name are displayed for each destination candidate. In FIG. 13, the icons indicating the operating states of the terminals are displayed as “offline” and “online (communicable)” from the top.

On the other hand, the storage/readout processing unit 59 of the communication management system 5 searches the destination list management table (see FIG. 9) based on the terminal ID “01aa” of the login request terminal (electronic blackboard 1a), and thereby the login request terminal The terminal ID “01aa” of the (electronic blackboard 1a) is extracted as the terminal ID of another terminal registered as a destination candidate (step S37). In the destination list management table shown in FIG. 9, the terminal IDs of the other terminals that are read are "01ba", "01ba", "01da", and the like.

Next, the storage/readout processing unit 59 of the communication management system 5 searches the terminal management table (see FIG. 8) based on the terminal ID “01aa” of the login request terminal (electronic blackboard 1a), and the login request terminal (electronic The operating state of the blackboard 1a) is acquired (step S38).

Then, the transmission/reception unit 51 obtains in step S38 the terminal whose operating state is “online” in the terminal management table (see FIG. 8) among the terminals related to the terminal ID extracted in step S37. Then, the "terminal status information" including the terminal ID "01aa" of the login request terminal (electronic whiteboard 1a) and the operating status "online" is transmitted (step S39). When transmitting/receiving the terminal state information to the electronic blackboard 1b, the transmitting/receiving unit 51 refers to the IP address of the electronic blackboard managed in the terminal management table (see FIG. 8) based on each terminal ID. Thereby, the terminal ID “01aa” of the login request terminal (electronic whiteboard 1a) and the operating state “online” are given to each of the other destination terminals that can communicate with the login request terminal (electronic blackboard 1a) as a destination candidate. Can be told. Therefore, the state of the destination candidate can be displayed also on the destination candidate (electronic blackboard 1b or the like) (step S40).

<Telecommunication start processing>
Next, a process in which the electronic blackboard 1a starts remote communication with the electronic blackboard 1b will be described with reference to FIG. FIG. 14 is a sequence diagram showing a process of starting remote communication.

First, when the user of the request source terminal (electronic blackboard 1a) selects the electronic blackboard 1b by pressing the destination candidate (terminal ID "01ba") shown in FIG. 8, the reception unit shown in FIG. 12a receives a request to start a call with the destination terminal (electronic blackboard 1b) (step S61). Then, the transmission/reception unit 11a of the request source terminal (electronic blackboard 1a) transmits start request information indicating that the call is to be started to the communication management system 5 (step S62). This start request information includes the terminal ID “01aa” of the request source terminal (electronic blackboard 1a) and the terminal ID “01ba” of the destination terminal (electronic blackboard 1b). As a result, the transmission/reception unit 51 of the communication management system 5 receives the start request information and the IP address of the request source terminal (electronic whiteboard 1a) that is the transmission source.

Then, the storage/read processing unit 59 uses the terminal management table based on the terminal ID “01aa” of the request source terminal (electronic blackboard 1a) and the terminal ID “01ba” of the destination terminal (electronic blackboard 1b) included in the start request information. In FIG. 8, both the operating state field portions of the records including the terminal ID “01aa” and the terminal ID “01ba” are changed to “calling” (step S63). In this state, the request source terminal (electronic blackboard 1a) and the destination terminal (electronic blackboard 1b) have not started the video conference, but are in a talking state, and the third electronic blackboard terminal is the request source terminal ( When a call is attempted to the electronic whiteboard 1a) or the destination terminal (electronic blackboard 1b), a notification sound or display indicating that a so-called busy state is output.

Next, a process of executing a session for selecting the relay device 3 that is actually used will be described. First, the generation unit 53 of the communication management system 5 generates a session ID used to execute a session for selecting the relay device 3 (step S64). Here, a case where the session ID “se01” is generated will be described.

Then, the storage/read processing unit 59, in the session management table (see FIG. 10), the session ID “se01” generated in step S64, the terminal ID “01aa” of the request source terminal (electronic blackboard 1a), and the destination. The terminal ID “01ba” of the terminal (electronic blackboard 1b) is associated and stored and managed (step S65).

Next, the selection unit 54 of the communication management system 5 shown in FIG. 8 uses the relay device management table (see FIG. 11) and the terminal management table (see FIG. 8) to request the terminal (electronic blackboard 1a). And the relay device 3 for relaying the call between the two locations of the destination terminal (electronic blackboard 1b) is selected (step S66). Specifically, of the relay device IDs related to the relay device whose operating state is “ON line” in the relay device management table (see FIG. 11), the request source terminal (electronic blackboard 1a) in the terminal management table (see FIG. 8). The relay device ID related to the relay device 3 having the IP address close to the IP address of is selected. Here, a case where the relay device 30a (relay device ID “111a”) is selected will be continuously described below.

When the process of selecting the relay device in step S66 is completed, the transmission/reception unit 51 of the communication management system 5 transmits the relay device selection information to the request source terminal (electronic blackboard 1a) (step S67-1). .. The relay device selection information includes the IP address of the relay device 3 selected in step S66 and the session ID “se0101” generated in step S64. Thereby, the request source terminal (electronic blackboard 1a) can acquire the IP address of the communication management system 5 that is the transmission source of the relay device selection information.

Further, the transmission/reception unit 51 of the communication management system 5 transmits the relay device selection information to the destination terminal (electronic blackboard 1b) (step S67-2). The relay device selection information includes the IP address of the relay device 3 selected in step S66, the terminal ID “01aa” of the request source terminal (electronic blackboard 1a), and the session ID “se01” generated in step S64. It is included. As a result, the destination terminal (electronic blackboard 1b) can acquire the IP address of the communication management system 5 that is the transmission source of the relay device selection information in the execution of the session with the session ID “se01”.

Next, in response to the processing in step S67-1, the transmission/reception unit 11 of the request source terminal (electronic blackboard 1a) receives the relay device selection information from the communication management system 5 by the processing in step S67-1. The reception completion information indicating that is completed is transmitted (step S68-1). The reception completion information includes the session ID transmitted and received in the process of step S67-1. As a result, the communication management system 50 acquires that the transmission of the relay device selection information executed with the specific session ID “se01” is completed.

Further, in response to the process of step S67-2, the destination terminal (electronic blackboard 1b) similarly indicates to the communication management system 5 that reception of the relay device selection information has been completed by the process of step S67-2. The reception completion information is transmitted (step S68-2). Also in this case, the communication management system 5 acquires that the transmission of the relay device selection information executed with the specific session ID “se01” is completed.

As described above, the electronic blackboards 1a and 1b can hold a video conference by transmitting and receiving the video data and the sound data via the relay device 3 selected in step S66.

<Communication processing of material images and stroke images>
Next, communication processing of the material image displayed on the electronic blackboard 1 and the input stroke image will be described with reference to FIGS. 15 to 17. 15 and 16 are sequence diagrams showing a process of sharing the image data of the material image and the stroke data of the stroke image. Here, when the image data of the material image and the stroke data of the stroke image are shared by the electronic blackboards 1a and 1b, the material image displayed on the electronic blackboard 1a and the input stroke image are also displayed on the electronic blackboard 1b. The case will be described. 17, (a) is a screen example of the electronic blackboard 1a, (b) is a screen example of the electronic blackboard 1b, (c) is a screen example of the electronic blackboard 1a, and (d) is a screen example of the electronic blackboard 1b. ..

First, in the electronic blackboard 1a at the site A, the screen shown in FIG. 17A is displayed on the display 180 by the display control unit 14a. Here, the material image d1, the image v2 of the site B, and the “share” button b1 that is pressed when sharing the material image d1 are displayed. In this state, when the user a of the electronic blackboard 1a presses the "share" button b1, the receiving unit 12a receives the process of sharing the material image from the user a (step S101). Next, the transmission/reception unit 11a transmits request information indicating that a URL (Uniform Resource Locator) indicating the storage location of the image data of the material image is requested to the communication management system 5 (step S102). As a result, the transmission/reception unit 51 of the communication management system 5 receives the request information. The URL is an example of storage location information, and the storage location information also includes a URI (Uniform Resource Identifier).

Next, the generation unit 53 of the communication management system 5 generates a URL indicating the storage location of the image data of the material image (S103). Then, the transmitting/receiving unit 51 transmits the URL of the image data generated by the generating unit 53 to the electronic blackboard 1a. As a result, the transmission/reception unit 11a of the electronic blackboard 1a receives the URL of the image data.

Next, the transmission/reception unit 11a of the electronic blackboard 1a transmits a start notification of uploading the image data of the material image to the communication management system 5 (step S105). As a result, the transmission/reception unit 51 of the communication management system 5 receives the start notification.

Next, the transmission/reception unit 51 transfers the start notification to the electronic whiteboard 1b of the other party during the remote conference (step S106). As a result, the transmitting/receiving unit 11b of the electronic blackboard 1b receives the start notification. The display control unit 14d of the electronic whiteboard 1b displays the screen as shown in FIG. 17B on the display 180 of the electronic whiteboard 1b (step S107). Here, the image v1 of the site A and the “share” button b2 that is originally pressed when sharing are displayed, and the start notification of step S106 visually shows the time lapse of downloading the image data of the material image. Output is performed to display the hourglass icon c2.

In addition, the elapsed time can be indicated by a still image hourglass or a moving image hourglass with sand movement. The hourglass icon c2 is an example of schedule information indicating that image data is scheduled to be downloaded. As another example of the schedule information, an icon other than an hourglass (for example, a clock icon) may be used, a character (and/or “symbol”) may be used instead of an icon, and an icon and a character (and And/or “symbol”). Further, the schedule information may be a notification by sound. In this case, sound is output from the speaker 150 by the video/sound processing unit 13a, not by the display control unit 14a.

The electronic blackboard 1a may perform the process of step S102 after the process of step S105. Further, the communication management system 5 may transmit the URL of the image data in step S104 after receiving the image data upload start notification in step S105.

Subsequently, the transmission/reception unit 11a of the electronic blackboard 1a uploads the image data of the material image to the URL relating to the image storage device 7 received in step S104 (step S108). As a result, the transmission/reception unit 71 of the image storage device 7 receives the image data. Then, the storage/readout processing unit 79 of the image storage device 7 stores the image data in the URL in the storage unit 7000 (step S109).

Subsequently, at the location A, the user A1 contacts the electronic pen 180 or the hand H on the display 180 of the electronic blackboard 1a to move the electronic pen 180 or the hand H, so that the reception unit 12a receives the input of the movement stroke (trajectory). (Step S110). Then, the image processing unit 17a creates stroke data (for example, coordinate data (x, y)) for displaying the stroke image on the two-dimensional display 180 based on the stroke, and the display control unit 14a performs electronic processing. A stroke image is displayed on the display 180 of the blackboard 1a (step S111). As a result, the stroke image st1 is displayed as shown in FIG.

Next, the transmission/reception unit 11a transmits the stroke data for reproducing the stroke image created in step S111 to the communication management system 5 (step S112). As a result, the transmission/reception unit 51 of the communication management system 5 receives the stroke data of the stroke image. Then, in the communication management system 5, the storage/readout processing unit 59 stores the stroke data (step S113).

Next, the transmission/reception unit 51 transfers the stroke data to the electronic whiteboard 1b on the partner side (step S114). As a result, the transmission/reception unit 11b of the electronic blackboard 1b receives the stroke data. Then, in the electronic blackboard 1b, the image processing unit 17b creates a stroke image based on the stroke data, and the display control unit 14b displays the stroke image on the display 180 of the electronic blackboard 1b (step S115). As a result, as shown in FIG. 17D, the same stroke image st1 as that of the other party's electronic blackboard 1a is displayed.

Then, as shown in FIG. 16, the transmission/reception unit 71 of the image storage device 7 transmits a completion notice indicating that the upload of the image data of the material image is completed to the electronic blackboard 1a (step S121). As a result, the transmitting/receiving unit 11a of the electronic whiteboard 1a receives the completion notice.

Next, the transmission/reception unit 11a of the electronic blackboard 1a transmits a completion notice indicating that the upload of the image data of the material image is completed to the communication management system 5 (step S122). This completion notification includes the URL of the image data received in step S104. As a result, the transmission/reception unit 51 of the communication management system 5 receives the completion notification. Then, the transmission/reception unit 51 transfers the completion notice including the URL to the electronic whiteboard 1b of the other party (step S123). As a result, the transmission/reception unit 11b of the electronic whiteboard 1b receives the completion notice.

Next, the transmission/reception unit 11b of the electronic blackboard 1b transmits request information indicating a request to download the image data of the material image to the URL relating to the image storage device 7 received in step S123 (step S124). .. As a result, the transmission/reception unit 71 of the image storage device 7 receives the request information.

Next, in the image storage device 7, the storage/readout processing unit 79 reads out the image data of the requested material image from the storage unit 7000 based on the URL (step S125). Then, the transmission/reception unit 71 transmits the image data of the material image that is the request target to the electronic blackboard 1b that is the request source (step S126). As a result, the transmission/reception unit 11b of the electronic blackboard 1b downloads (receives) the image data. Then, on the electronic blackboard 1b side, the display control unit 14b displays the same material image as the material image d1 shown in FIG. 17C on the screen shown in FIG. 17D, and The hourglass icon c2 that has been displayed until then is hidden.

[Main effects of the embodiment]
As described above, even if the electronic blackboard 1a transmits the stroke data of the stroke image after transmitting the image data of the material image, the stroke data has a much smaller data amount than the image data. Stroke data reaches the electronic blackboard 1b first. On the other hand, in the present embodiment, the communication management system 5 receives the upload start notification from the electronic blackboard 1a uploading the image data, and transfers (transmits) the start notification to the electronic blackboard 1b (see S106). ). Then, on the electronic blackboard 1b, as shown in FIG. 17(B), output is performed to display an hourglass icon c2 that visually indicates that the image data of the material image is to be downloaded (see S107). .. As a result, the users B1 and B2 of the electronic blackboard 1b at the base B notice the existence of the material image such as the material to be sent later while the stroke images are being displayed, and thus the electronic blackboard at the base A is displayed. The effect that the smooth communication with the user A1 of 1a can be performed is produced.

[Supplement to Embodiment]
In the above embodiment, an office device, which is an electronic blackboard, has been described as an example of a communication terminal, but the invention is not limited to this. Other examples of communication terminals include PCs, smartphones, smart watches, car navigation terminals, and the like. Further, the communication terminal includes a medical device. In the case of a medical device, the document image is the patient image.

Further, in the above-described embodiment, the case where the video conference is held by the communication system has been described, but the present invention is not limited to this, and a meeting, a general conversation between family and friends, remote diagnosis, or one-way communication can be performed. It may be used to present information.

1a Electronic blackboard (an example of communication terminal)
1b Electronic blackboard (an example of communication terminal)
3 Relay Device 5 Communication Management System 7 Image Storage Device 51 Transmitter/Receiver (Example of Transmitting Means, Example of Receiving Means)
52 Authentication unit (an example of authentication means)
53 Generator (an example of generator)
54 selection unit (an example of selection means)
55 Judgment unit (an example of judgment means)
5001 Authentication management DB
5002 terminal management DB
5003 Destination list management DB
5004 Session management DB
5005 Relay device management DB

JP, 2011-254453, A JP, 2005-70543, A

Claims (10)

A communication management system for managing data sharing in a plurality of communication terminals,
Transmitting means for transmitting the storage position information indicating the storage position of the image data so that the first communication terminal receives,
Receiving means for receiving a start notification transmitted by the first communication terminal and indicating that the upload of the image data is started,
Have
The transmission means transmits the start notification so that the second communication terminal receives the start notification,
The receiving means receives stroke data for reproducing a stroke image transmitted by the first communication terminal,
The transmitting means transmits the stroke data so that the second communication terminal receives the stroke data;
Communication management system characterized by. The communication management system according to claim 1, wherein
The receiving unit receives request information transmitted by the first communication terminal and requesting the storage location information,
A communication management system comprising: a generation unit that generates the storage location information based on reception of the request information. A communication management system according to claim 1 or 2,
The first communication terminal;
The second communication terminal;
A communication system comprising: The communication system according to claim 3, wherein the second communication terminal displays schedule information indicating that the image data is scheduled to be downloaded based on the reception of the start notification. The communication system according to claim 4, wherein the schedule information includes an icon that visually indicates the passage of time. The communication system according to claim 5, wherein the icon indicates an hourglass. A communication management system according to claim 1 or 2,
The first communication terminal;
The second communication terminal;
An image storage device having a storage location of the image data,
Having a communication system. The first communication terminal transmits the image data to the image storage device based on the storage location information,
The first communication terminal transmits the stroke data to the communication management system,
The communication system according to claim 5, wherein: A communication method executed by a communication management system that manages data sharing in a plurality of communication terminals,
A transmitting step of transmitting storage location information indicating a storage location of the image data so that the first communication terminal receives the storage location information;
A receiving step of receiving a start notification transmitted by the first communication terminal and indicating that the upload of the image data is to be started;
Run
The transmitting step includes a process of transmitting the start notification so that the second communication terminal receives the start notification.
The receiving step includes a process of receiving stroke data for reproducing a stroke image transmitted by the first communication terminal,
The transmitting step includes a process of transmitting the stroke data so that the second communication terminal receives the stroke data.
A communication method characterized by. A program that causes a computer to execute the method according to claim 9.