Communication system

Abstract

To provide a communication system capable of preventing the generation of a communication failure in emergency, and securing communication means.SOLUTION: A communication system comprises: a message management server device 20 that receives communication information transmitted from a school terminal device 10, transmits the communication information to a protector terminal device 40, and receives the communication information transmitted from the protector terminal device 40; and a board management server device 30 that receives the communication information transmitted from the school terminal device 10, enables a blowsing the communication information from the protector terminal device 40, and does not receive the communication information from the protector terminal device 40. The communication system can switch the transmission of the communication information from the school terminal device 10 to the message management server device 20 and a transmission of the communication information from the school terminal device 10 to the board management server device 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a contact system for transmitting and receiving contact information between terminal devices. [Background technology]

[0002] Conventionally, techniques have been proposed for transmitting and receiving messages between a specific organization and terminal devices of people who belong to that organization.

[0003] For example, Patent Document 1 proposes a system for transmitting and receiving messages between a school and a terminal device of a guardian of a student belonging to the school. Specifically, an education support system having a contact function from the school and a contact function from guardians / students is disclosed, and a method for transmitting and receiving contact information between a terminal device of the school and a terminal device of the guardian / students via a server device is proposed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-221892 A Summary of the Invention [Problem to be solved by the invention]

[0005] Here, when contact information is sent and received between terminal devices via a server device, as in the education support system described in Patent Document 1, in an emergency such as a disaster or crime, there is a possibility that the transmission of contact information from the terminal devices of guardians / students to the server device will be concentrated, which may cause a communication failure and make it impossible to use the contact function via the server device. It is very problematic if the contact function stops even in an emergency.

[0006] In view of the above circumstances, an object of the present invention is to provide a communication system that can prevent communication failures in emergencies and ensure communication means even in emergencies. [Means for solving the problem]

[0007] The communication system of the present invention comprises a first server device that accepts contact information sent from a first terminal device and transmits the contact information to a second terminal device, as well as accepting contact information sent from the second terminal device, and a second server device that accepts contact information sent from the first terminal device, makes the contact information viewable from the second terminal device, and does not accept contact information from the second terminal device, and is capable of switching between transmitting contact information from the first terminal device to the first server device and transmitting contact information from the first terminal device to the second server device. Effect of the Invention

[0008] According to the communication system of the present invention, in addition to a first server device that accepts contact information from a first terminal device and a second terminal device, a second server device is provided that accepts contact information sent from the first terminal device and makes the contact information viewable from the second terminal device, but does not accept contact information from the second terminal device, and it is possible to switch between sending contact information from the first terminal device to the first server device and sending contact information from the first terminal device to the second server device. Therefore, by providing multiple communication means in this manner, it is possible to prevent communication failures, for example in emergencies, and to ensure communication means. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a school communication system using an embodiment of the communication system of the present invention. [Diagram 2] FIG. 13 is a diagram showing an example of a home screen displayed on a school terminal device. [Diagram 3] FIG. 13 is a diagram showing an example of a message creation screen displayed on a school terminal device. [Figure 4] FIG. 13 is a diagram showing an example of a message transmission status list displayed on a school terminal device. [Diagram 5] FIG. 13 is a diagram showing an example of a message list screen displayed on a parent terminal device. [Figure 6] FIG. 13 is a diagram showing an example of a school bulletin board history list screen displayed on a school terminal device. [Figure 7] FIG. 13 is a diagram showing an example of a message board message creation screen displayed on a school terminal device. [Figure 8] FIG. 13 is a diagram showing an example of a school bulletin board details screen displayed on a school terminal device. [Figure 9] FIG. 13 is a diagram showing an example of a home screen displayed on a parent terminal device. [Figure 10] FIG. 13 is a diagram showing an example of a pop-up notification displayed on a parental terminal device. [Figure 11] FIG. 13 is a diagram showing an example of a bulletin board screen displayed on a parent terminal device. [Figure 12] FIG. 13 is a diagram showing an example of a message details screen displayed on a parent terminal device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A school communication system using an embodiment of the communication system of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a block diagram showing a schematic configuration of a school communication system 1 of this embodiment.

[0011] The school communication system 1 of this embodiment is a system for transmitting and receiving communication information between the school and parents, and includes a school terminal device 10, a message management server device 20, a bulletin board management server device 30, and a parent terminal device 40. In this embodiment, the message management server device 20 corresponds to the first server device of the present invention, and the bulletin board management server device 30 corresponds to the second server device of the present invention. Although only one school terminal device 10 is shown in FIG. 1, this is not limiting, and multiple school terminal devices 10 may be provided. Similarly, multiple parent terminal devices 40 may be provided.

[0012] The school terminal device 10 and the message management server device 20, between the message management server device 20 and the parent terminal device 40, between the school terminal device 10 and the bulletin board management server device 30, and between the bulletin board management server device 30 and the parent terminal device 40 are connected by communication lines such as the Internet line, and are configured to be able to communicate.

[0013] The school communication system 1 of this embodiment is a system that, for example, under normal circumstances, allows the school to send messages including contact information to parents, and allows parents to send messages including contact information to the school, but in an emergency, for example, allows the school to post contact information on an electronic bulletin board, allows parents to view the contact information on the bulletin board, and does not accept messages from parents to the school.

[0014] Hereinafter, each device constituting the school communication system 1 of this embodiment will be described in detail.

[0015] The message management server device 20 accepts messages sent from the school terminal device 10 and transmits the messages to the parent terminal device 40, and also accepts messages sent from the parent terminal device 40 and transmits the messages to the school terminal device 10.

[0016] The message management server device 20 comprises a memory unit 21 that stores messages sent from the school terminal device 10, a destination management unit 22 that manages the destinations of messages sent from the school terminal device 10, and a control unit 23 that controls the entire message management server device 20.

[0017] The storage unit 21 has storage such as a hard disk, a semiconductor memory, etc. In this embodiment, the storage unit 21 corresponds to a first storage unit of the present invention.

[0018] The destination management unit 22 includes a table linking together identification information of a school, identification information of a grade at the school, identification information of a class at the grade, identification information of a student in the class, and identification information of the parent terminal device 40 of the student's parent.

[0019] The control unit 23 stores the message sent from the school terminal device 10 in the memory unit 21 together with the sender, destination, date and time of sending, etc. Then, based on the destination information added to the message, the control unit 23 refers to a table managed by the destination management unit 22 to identify the identification information of the destination parent terminal device 40, and transmits the message to the identified parent terminal device 40. In other words, the control unit 23 transmits a so-called push-type message to the parent terminal device 40.

[0020] The message management server device 20 also accepts messages sent from the parent terminal device 40 and transmits the messages to the school terminal device 10. Examples of messages transmitted from the parent terminal device 40 include a response message to a questionnaire message sent from a school to the parent terminal device 40, and a message informing the school of a student's absence.

[0021] The memory unit 21 stores messages sent from the parent terminal device 40, and the control unit 23 identifies the school terminal device 10 by referring to the table in the destination management unit 22, and transmits the parent's message to the identified school terminal device 10.

[0022] As described above, the message management server device 20 is a server device capable of transmitting messages sent from the school terminal device 10 to the parent terminal device 40, and also capable of transmitting messages sent from the parent terminal device 40 to the school terminal device 10, and is a server device capable of transmitting messages in both directions, from the school to parents and from parents to the school.

[0023] The message management server device 20 includes a central processing unit (CPU), semiconductor memories such as a read only memory (ROM) and a random access memory (RAM), storage such as a hard disk, and a communication interface (I / F).

[0024] A message management program, which is a web application, is installed in the storage of the message management server device 20. The message management program is started by the CPU, whereby the transmission and reception of the above-mentioned messages is controlled.

[0025] Some or all of the functions executed by the message management program may be implemented using hardware such as an Application Specific Integrated Circuit (ASCI), a Field Programmable Gate Array (FPGA), or other electrical circuits.

[0026] In this embodiment, the message management program, the school application, and the parent application operate in conjunction with each other to realize the message sending and receiving function of the school communication system 1.

[0027] Next, bulletin board management server device 30 will be described.

[0028] The bulletin board management server device 30 is a server device that manages the electronic bulletin board, receives messages sent from the school terminal devices 10, and posts the messages on the electronic bulletin board.

[0029] Bulletin board management server device 30 includes a memory unit 31 that stores messages transmitted from the school terminal devices 10, and a control unit 32 that controls the entire bulletin board management server device 30. In this embodiment, the memory unit 31 corresponds to the second memory unit of the present invention.

[0030] The memory unit 31 has storage such as a hard disk and a semiconductor memory, and stores messages transmitted from the school terminal devices 10 .

[0031] The control unit 32 stores the message sent from the school terminal device 10 in the memory unit 31 together with the message source, the posting date and time, etc. Then, the control unit 32 posts the message stored in the memory unit 31 to the electronic bulletin board, accepts access from the parent terminal device 40, and makes the electronic bulletin board viewable.

[0032] As described above, the bulletin board management server device 30 posts messages sent from the school terminal device 10 on the electronic bulletin board and makes them viewable by the parent terminal device 40, but does not accept messages from the parent terminal device 40. In other words, the bulletin board management server device 30 is a server device for one-way communication that makes messages posted on the electronic bulletin board viewable by the parent terminal device 40, but does not accept messages from parents to the school.

[0033] In this embodiment, when a parent application (to be described later) of the parent terminal device 40 is started and there is a request from the parent terminal device 40 to view the electronic bulletin board, if a new message has been posted on the electronic bulletin board since the parent terminal device 40 last started up, the control unit 32 notifies the parent terminal device 40 of that fact with a message. That is, the control unit 32 performs a so-called pop-up type notification.

[0034] Then, when the control unit 32 receives a request to view the electronic bulletin board sent from the parent terminal device 40, it permits access to and viewing of the electronic bulletin board stored in the memory unit 31 without going through the above-mentioned web application.

[0035] Bulletin board management server device 30 includes a CPU, semiconductor memories such as ROM and RAM, storage such as a hard disk, and a communication I / F.

[0036] A bulletin board management program, which is a web application, is installed in the storage of bulletin board management server device 30. This bulletin board management program is started by the CPU to control posting to the electronic bulletin board described above.

[0037] Some or all of the functions executed by the bulletin board management program may be implemented using hardware such as an ASCI, FPGA, or other electrical circuits.

[0038] In this embodiment, the bulletin board function of the school communication system 1 is realized by the above-mentioned bulletin board management program, the school application, and the parent application operating in cooperation with each other.

[0039] The school terminal device 10 is used by school staff such as teachers, and may be, for example, a desktop computer or a notebook computer, but is not limited to these and may also be a mobile terminal such as a tablet terminal or a smartphone.

[0040] The school terminal device 10 includes a control unit 11. The control unit 11 controls the entire school terminal device 10. In particular, the control unit 11 displays a contact message creation screen used when the school sends a message to a parent or guardian, and a bulletin board message creation screen used when the school posts a message on an electronic bulletin board.

[0041] Furthermore, the control unit 11 switches between sending a message from the school terminal device 10 to the message management server device 20 and sending a message from the school terminal device 10 to the bulletin board management server device 30. Specifically, in this embodiment, server selection information for switching between sending a message to the message management server device 20 and sending a message to the bulletin board management server device 30 is received, and the destination of the message is switched based on the server selection information. Note that the reception of server selection information will be described in detail later.

[0042] The school terminal device 10 has a display unit 12 such as a liquid crystal display, on which a message creation screen, a message board message creation screen, and the like are displayed.

[0043] The school terminal device 10 also has an input unit 13 such as a mouse and a keyboard, and the input unit 13 accepts setting inputs for the message creation screen and the bulletin board message creation screen.

[0044] When a tablet terminal or a smartphone is used as the school terminal device 10, the touch panel of the tablet terminal or smartphone functions as both the display unit 12 and the input unit 13.

[0045] The school terminal device 10 includes a CPU, semiconductor memories such as ROM and RAM, storage such as a hard disk, and a communication I / F.

[0046] A school application is installed in the storage of the school terminal device 10. When the school application is started by the CPU, a contact message creation screen and a bulletin board message creation screen are displayed on the school terminal device 10, and various settings can be input. Note that instead of using the school application installed in the storage as in this embodiment, a school application provided via a web browser may be used.

[0047] In addition, some or all of the functions executed by the school application may be configured using hardware such as an ASCI, FPGA, or other electrical circuits.

[0048] The parent terminal device 40 is used by a parent, and may be a mobile terminal such as a smartphone or tablet terminal, but is not limited to these, and may also be a desktop computer or a notebook computer.

[0049] The parent terminal device 40 includes a control unit 41. The control unit 41 controls the entire parent terminal device 40. In particular, the control unit 41 displays messages sent from the school, electronic bulletin boards, and the like.

[0050] The parent terminal device 40 has a display unit 42 such as a liquid crystal display, on which messages sent from the school and electronic bulletin boards are displayed.

[0051] The parent terminal device 40 also has an input unit 43 such as a mouse and a keyboard, and the input unit 43 receives setting inputs such as a parent's answer message.

[0052] When a tablet terminal or a smartphone is used as the parent terminal device 40, the touch panel of the tablet terminal or the smartphone functions as both the display unit 42 and the input unit 43.

[0053] The parent terminal device 40 includes a CPU, semiconductor memories such as ROM and RAM, storage such as a hard disk, and a communication I / F.

[0054] A parental application is installed in the storage of the parental terminal device 40. When the parental application is started by the CPU, a message viewing screen, a message board viewing screen, a reply message creation screen, and the like are displayed on the parental terminal device 40, making it possible to view messages and message boards and input various settings. Note that instead of using a parental application installed in the storage as in this embodiment, a parental application provided via a web browser may be used.

[0055] In addition, some or all of the functions executed by the parent application may be configured using hardware such as an ASCI, FPGA, or other electrical circuits.

[0056] Next, a description will be given of the flow of processing in the school communication system 1 of this embodiment. First, a description will be given of the processing performed when a message is sent from a school to a guardian.

[0057] First, a school staff member (here, "Mr. X") starts up the school application on the school terminal device 10, and displays the home screen as shown in Fig. 2. As shown in Fig. 2, the home screen displays an icon A1 for individual communication and an icon A2 for the school bulletin board.

[0058] When the school sends an individual message to a parent, the individual contact icon A1 shown in Fig. 2 is selected. When the individual contact icon A1 is selected, the school terminal device 10 displays a message creation screen as shown in Fig. 3. In this embodiment, the selection information of the individual contact icon A1 or the school bulletin board icon A2 corresponds to the server selection information of the present invention.

[0059] The message creation screen shown in Figure 3 displays a distribution manuscript selection field R1 for selecting the electronic data file of the manuscript to be distributed, a title input field R2 for accepting input of the title of the message, a message input field R3 for accepting input of the body of the message, a distribution class selection field R4 for selecting the grade and class to which the message will be delivered, and a distribution date and time selection field R5 for selecting the distribution date and time.

[0060] Then, necessary information is entered and set in each of the fields R1 to R4 on the message creation screen. In the distribution class selection field R4, the registration year of the class is selected using a pull-down box, and the grade and class for the selected registration year are selected. For example, when a message is to be distributed to the parents of students in all grades, the check box CB1 for all grades is checked, when a message is to be distributed to the parents of students in all classes in the first year, the check box CB2 for the first year is selected, and when a message is to be distributed to the parents of students in a specific class in the first year, the check boxes CB3 to CB5 for classes 1 to 3 are selected.

[0061] Furthermore, if the message is to be sent immediately after registration, the "Immediate" radio button in the "Delivery Date and Time" column is selected, and if a date and time for sending is to be reserved, the "Reserve" radio button is selected and the date and time for sending the message is entered.

[0062] When the "Subscribe" button is selected, the content entered on the message creation screen is transmitted from the school terminal device 10 to the message management server device 20 and registered (stored). The message management server device 20 then transmits the registered message to the parent terminal device 40, which is the destination.

[0063] Furthermore, on the basis of the information registered in the message management server device 20, the school terminal device 10 displays a message transmission status list (letter delivery / delivery status) as shown in FIG.

[0064] As shown in FIG. 4, the message sending status list displays the message's "title," "distribution status," "distribution (reservation) date and time," which is the date and time the message was sent (reserved for sending) from the school terminal device 10, "destination class," "number of messages read," "creation date and time," which is the date and time the message was created (registered), and "registerer," which is the person who registered the message.

[0065] Moreover, when the "Display" button in the "Preview" column is selected, the electronic data file of the original is opened and a preview is displayed.

[0066] After the message is sent to the parent terminal device 40 as described above, the parent terminal device 40 displays a message list screen as shown in Fig. 5, which displays a list of messages sent from the school terminal device 10. When a specific message is selected on the message list screen shown in Fig. 5, the specific contents of the message are displayed, and when an attached file is selected, the screen switches to a letter details screen in which an electronic data file such as a PDF file is opened.

[0067] In addition, if the message delivered from the school terminal device 10 to the parent terminal device 40 is a message that requires a response, such as a questionnaire message as described above, the response content is set and input in the parent terminal device 40, and the response message is sent from the parent terminal device 40 to the message management server device 20, and then sent from the message management server device 20 to the school terminal device 10.

[0068] Next, a process for posting a message on the electronic bulletin board and a process for viewing the posted message will be described.

[0069] When posting a message on the electronic bulletin board, the school bulletin board icon A2 is selected on the home screen shown in Fig. 2. When the school bulletin board icon A2 is selected, the school terminal device 10 displays a school bulletin board history list screen as shown in Fig. 6.

[0070] 6 shows a list section L of messages posted on the bulletin board in the past. The message list section L shows the posting date, the message title, a details button, a delete button, and the like.

[0071] Additionally, a new post button for posting a new message is displayed on the school bulletin board history list screen shown in Fig. 6. When the new post button is selected, a bulletin board message creation screen is displayed as shown in Fig. 7. The bulletin board message creation screen shown in Fig. 7 displays a title input field S1 for inputting the title of the message, a message input field S2 for inputting the main text of the message, and a posting period input field S3 for inputting the posting period (start and end), etc.

[0072] Then, after inputting information into each field on the bulletin board message creation screen, when the "Post" button shown in Fig. 7 is selected, the contents inputted on the bulletin board message creation screen are registered (stored) in the bulletin board management server device 30 from the school terminal device 10 and posted on the electronic bulletin board. Then, the message is newly added to the message list field L on the school bulletin board history list screen shown in Fig. 6.

[0073] When the Details button for a given post listed in the message list column L on the school bulletin board history list screen is selected, a School Bulletin Board Details screen is displayed as shown in Fig. 8, displaying the detailed content of the posted message. When the "Edit" button displayed on the School Bulletin Board Details screen shown in Fig. 8 is selected, the content of the message can be edited, and when the "Post" button is selected after editing, the edited content is posted to the electronic bulletin board.

[0074] When a parent wishes to view messages posted on the bulletin board, a parent application is launched in the parent terminal device 40. At this time, if no new messages have been posted to the bulletin board since the parent application was last launched, that is, if the bulletin board has not been updated between the time the parent application was last launched and the current time, the home screen shown in Fig. 9 is displayed.

[0075] On the other hand, if a new message has been posted to the bulletin board between the last time the parent application was launched and the current time, i.e., if the bulletin board has been updated between the last time the parent application was launched and the current time, a notification stating "There is a new post" will be displayed, as shown in Figure 10.

[0076] When the school bulletin board icon A2 on the home screen shown in FIG. 9 is selected, or when the “Confirm” button shown in FIG. 10 is selected, the bulletin board screen shown in FIG. 11 is displayed on the parent terminal device 40.

[0077] A list column ML of messages posted on the electronic bulletin board is displayed on the bulletin board screen shown in Fig. 11. In the message list column ML, the title, poster, and posting date and time of the message posted on the electronic bulletin board are displayed.

[0078] When any message is selected from the message list column ML on the bulletin board screen shown in FIG. 11, a message details screen as shown in FIG. 12 is displayed, showing the contents of the main text of the message.

[0079] According to the above embodiment of the school communication system 1, in addition to the message management server device 20 that accepts contact information from the school terminal device 10 and the parent terminal device 40, a bulletin board management server device 30 that does not accept contact information from the parent terminal device 40 is provided, and it is possible to switch between sending contact information from the school terminal device 10 to the message management server device 20 and sending contact information from the school terminal device 10 to the bulletin board management server device 30.Therefore, by providing multiple communication means for the message management server device 20 and the bulletin board management server device 30, it is possible to prevent communication failures and ensure communication means even in emergencies.

[0080] In addition, in the school communication system 1 of the above embodiment, the sending of messages to the message management server device 20 and the bulletin board management server device 30 are switched based on the server selection information set in the school terminal device 10, so that the message destination can be switched appropriately depending on the situation.

[0081] Furthermore, in the school communication system 1 of the above embodiment, the bulletin board management server device 30 allows the parent terminal device 40 to view the communication information stored in the memory unit 31 by directly accessing the memory unit 31 without going through a web application, thereby reducing the load on the bulletin board management server device 30 and making communication failures less likely to occur.

[0082] Furthermore, in the school communication system 1 of the above embodiment, when a new message is sent from the school terminal device 10, the message management server device 20 sends a push-type message to the parent terminal device 40, and when a new post is made to the electronic bulletin board, the bulletin board management server device 30 sends a pop-up notification, thereby reducing the amount of communication between the bulletin board management server device 30 and the parent terminal device 40 and making communication failures less likely to occur.

[0083] Furthermore, the present invention is not limited to the above-described embodiment, and the components can be modified and embodied in the implementation stage without departing from the gist of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in the above-described embodiment. For example, all the components shown in the embodiment may be appropriately combined. Of course, various modifications and applications are possible without departing from the spirit of the invention.

[0084] The present invention further discloses the following supplementary notes.

[0085] (Appendix 1) The communication system of the present invention comprises a first server device that accepts contact information sent from a first terminal device and transmits the contact information to a second terminal device, as well as accepting contact information sent from the second terminal device, and a second server device that accepts contact information sent from the first terminal device, makes the contact information viewable from the second terminal device, and does not accept contact information from the second terminal device, and is capable of switching between transmitting contact information from the first terminal device to the first server device and transmitting contact information from the first terminal device to the second server device.

[0086] (Appendix 2) In the communication system described in Appendix 1, based on server selection information set in the first terminal device, it is possible to switch between sending contact information from the first terminal device to the first server device and sending contact information from the first terminal device to the second server device.

[0087] (Appendix 3) In the communication system described in Supplementary Note 1 or 2, the first server device has a first memory unit that stores contact information sent from the first terminal device, and reads out the contact information stored in the first memory unit using a web application possessed by the first server device and transmits it to the second terminal device, and the second server device has a second memory unit that stores the contact information sent from the first terminal device, and the second terminal device can view the contact information stored in the second memory unit by directly accessing the second memory unit without going through the web application possessed by the second server device.

[0088] (Appendix 4) In the communication system described in any one of Supplementary Notes 1 to 3, when a first server device receives new contact information sent from a first terminal device, it transmits the new contact information to a second terminal device in response to the reception, and when a second server device receives new contact information sent from the first terminal device, it notifies the second terminal device in response to a request from the second terminal device. [Explanation of symbols]

[0089] 1. School Communication System 10. School terminal equipment 11 Control section 12 Display section 13 Input section 20 Message management server device 21 Memory section 22 Destination Management Department 23 Control Unit 30 Bulletin board management server device 31 Storage section 32 Control section 40 Parental terminal device 41 Control section 42 Display section 43 Input section

Claims

1. a first server device that receives contact information transmitted from a first terminal device, transmits the contact information to a second terminal device, and receives contact information transmitted from the second terminal device; a second server device that receives contact information transmitted from the first terminal device, makes the contact information viewable from the second terminal device, and does not accept contact information from the second terminal device; A contact system capable of switching between transmitting contact information from the first terminal device to the first server device and transmitting contact information from the first terminal device to the second server device.

2. 2. The communication system according to claim 1, wherein the transmission of contact information from the first terminal device to the first server device and the transmission of contact information from the first terminal device to the second server device are switched based on server selection information set in the first terminal device.

3. The first server device includes a first storage unit that stores contact information transmitted from the first terminal device, and the first server device reads the contact information stored in the first storage unit by a web application included in the first server device and transmits the contact information to the second terminal device; The communication system of claim 1, wherein the second server device is provided with a second memory unit that stores contact information transmitted from the first terminal device, and the second terminal device is able to view the contact information stored in the second memory unit by directly accessing the second memory unit without going through a web application possessed by the second server device.

4. when the first server device receives new contact information transmitted from the first terminal device, the first server device transmits the new contact information to the second terminal device in response to the reception; 2. The communication system according to claim 1, wherein when the second server device receives new contact information sent from the first terminal device, it notifies the second terminal device in response to a request from the second terminal device.

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