JPH08331244A - Automatic updating function for terminal telephone number directory - Google Patents

Abstract

PURPOSE: To reduce the number and capacity of times of transfer by automatically reflecting the data change of a center on each terminal by managing a telephone number directory of respective terminals for selecting an opposite party terminal altogether as a database at the center through nodes. CONSTITUTION: Each terminal 1-01 can select the opposite party to be connected out of the stored telephone number directory or can select it by directly inputting the number of the party and connects it with a center 1-03 through nodes from 1 to 3 of an exchange device 1-02. Each node discriminates whether the terminal of the opposite party designated by a connecting request from the terminal 1-01 exists in a network or not, in the case of NO, that terminal is connected to the center and the existence of the terminal 1-01 requiring updating is reported. The center 1-03 manages the database of the telephone number directory of all the terminals altogether, performs the change, addition and deletion of data and automatically changes the telephone number directory of the respective terminals as well. Thus, real-time property can be secured and the number of times of transfer and the contents of transfer can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function for automatically updating a telephone number book held by a terminal, which is applied to a small-scale network installed for the purpose of connecting terminals to each other.

[0002]

2. Description of the Related Art As prior art 1, Japanese Patent Laid-Open No. 57-768.
Japanese Patent Laid-Open No. 8 discloses a dial number search method in which a dial number which is not in the dial address table of the calling terminal station is searched in the dial address table of the central station to determine a valid call or an invalid call.

Further, as the prior art 2, Japanese Patent Laid-Open No. 4-30
In 6946 publication, when there is no desired telephone number,
An inquiry is made to another composite terminal device for managing a telephone number via the LAN data communication control circuit of the communication control unit, the communication control unit makes a call with the acquired telephone number, and is acquired after the call processing. A composite terminal device is disclosed which includes a central processing unit for calling a telephone number and storing it in a telephone number management table of a storage unit together with the name of the other party.

Assuming that the central database is accessed on a call-by-call basis as shown in the above-mentioned prior art 1 and the terminal for personal use as shown in the above-mentioned prior art 2 is used, the number not registered in the telephone directory is used. A method is known in which, when an access is made, the number is sequentially updated and registered each time.

In addition, as a conventional system like this,
When updating the data of the center, the center side calls the terminal to judge the difference from the data held by the terminal side and transfer the difference of the data only when necessary, or access from the terminal with the intention of updating the center Only in the case, the method of downloading from the center to the terminal is known by the same method.

[0006]

However, the first problem with the conventional apparatus or system is that, when terminals are frequently added, the load is constantly concentrated on the central office, and at some stage, the It is necessary to change the data of all the terminals at once.

That is, in the system of the prior art 1, the access from the existing terminal to the central office is increased each time the terminal is added. This increase in load will continue steadily with respect to subsequent accesses, since there is no mechanism for storing the new number.

Therefore, when the number of terminals increases more than a certain number, it is conceivable that access to the central station will be concentrated and the delay time will increase.

The second problem is that there are many connection requests that require access time. That is, in the method of accessing each call in the conventional technique 2 and sequentially storing the accessed numbers,
It is effective when the connection destination is limited to some extent, such as when the terminal belongs to a specific individual, but in the case of a system that is used by an unspecified majority,
Since the connection destination has a high degree of arbitrariness, it is necessary to access the new destination one time without fail, and there is a problem that immediacy cannot be secured in many cases.

The third problem is that the conventional method has a small total number of terminals, the center side knows all the connected terminals, and there is a difference in the frequency of use between the terminals. . As a method to be applied to a system in which data is frequently updated, when the center regularly or irregularly updates data, the data held by each terminal is checked by polling and the difference data is transferred only when necessary. There is.

According to this method, as a result of the frequency of use, the latest data may be transferred to a terminal that does not require it, which is excellent in real-time property at the time of use, but each terminal in the network Because data is transferred every time,
Even a terminal that is unlikely to be actually used may generate a transfer request and reduce the throughput of the entire network.

A fourth problem is that the user of the terminal is conscious of the generation of data and makes a transfer request (download).
In this method, there is a problem in terms of operability and convenience.Therefore, a terminal that is not dedicated to a specific individual is used, the number of terminals in the entire network is small, and the hold time for each call is Not suitable for systems used in long form.

Therefore, an object of the present invention is to transfer only the difference between the version number of the telephone number book managed by the center and the version number of the telephone number book held by the terminal, and even if the two do not match, a large amount of data is transferred. It is to provide a function for automatically updating the telephone directory held by the terminal, which prevents transmission and improves the transmission efficiency, thereby suppressing the decrease in the throughput of the network.

Another object of the present invention is to improve operability: the telephone number book is always updated to the latest state by one access without paying attention even when adding a terminal, which is troublesome. In addition, if the terminal to be added is not related to the terminal, the update process is not started, useless update process is prevented, and only when it is really needed, it takes time to update, It is to provide an automatic updating function for a terminal-owned telephone directory that can prevent the influence on normal access as much as possible and improve operability.

Still another object of the present invention is that the maintenance person only needs to execute the update process at one location in the center, and after that, when the necessary user access is triggered, the terminal is automatically updated and maintenance is performed. As it is not necessary to perform transfer processing to all terminals as a person, the data management on the terminal side can be excluded from maintenance, and it is also transferred to the additional terminal itself with the same logic at the start of use. , The demarcation point with the terminal installation contractor is clear, and it is to provide an automatic updating function of the terminal-owned telephone directory that can improve maintainability.

[0016]

According to the present invention, the number of nodes and the number of terminals accommodated under the nodes are limited to slightly above the average human storage capacity, and all terminals in the network are There is a center that can be logically connected, and in the automatic updating function of the terminal-owned telephone number book applied to the small-scale network installed for the purpose of connecting between the terminals, it is necessary for connection for all terminals to be accommodated. It is equipped with a rewritable storage device that can store different destination identification information. A method of selecting a connection destination from the telephone number book and a method of directly inputting the destination number stored by the user are available. It has a function of identifying whether the terminal to be realized and the destination terminal designated in response to the connection request from the terminal exist in the network. If they do not exist, the terminal is connected to the center. And a node having a function of notifying a terminal that requires updating of the telephone directory is present,
It manages the database of the telephone number book relating to all terminals existing in the network, has a function of centrally adding, changing, and deleting information for identifying the terminal, and has a function for all terminals via the node. A terminal-owned telephone number book characterized in that it has a function of automatically judging and updating the telephone number book held by a system composed of the accessible center without user intervention. An automatic update function can be obtained.

[0017]

According to the automatic updating function of the terminal-owned telephone directory of the present invention, the terminal on the calling side in the network installed mainly for the purpose of transferring voice and low-speed data provides identification information for selecting the partner terminal. Data is distributed to the terminals along with the center data update in a system that manages the data collectively in the center and also holds it in each terminal, and the frequency of updating the original database is low and each terminal is not used only by a specific person. The method, especially the number of terminals in the network is small, the terminals are not used individually, but can be jointly used by arbitrary users, and the connection destination specification method can be realized in a simple form that is easy for users to understand. The changes made in are automatically reflected on the terminal side.

1. Effect on system users The system automatically recognizes that there is a difference between the telephone directory data held on the terminal side and the data in the center by the deployed management number. Therefore, the user of the terminal is automatically updated in the system when necessary without being aware of the data transfer trigger. If the user wants to update the data, the data can be transferred by pressing the request key. In this way, if the user clearly wants to communicate with a new location, he / she can make a data update request before the start of communication according to the judgment of the user. Also in this case, considering the case where the data has already been updated by another user, the management number is checked, and if it has been updated, the new transfer is left to the user's selection and flexible. It will be an operation method with a certain nature.

Data transfer is performed at the stage when the original communication of the requesting terminal is completed, and the system automatically starts during the unused time of the terminal, and at the actual connection stage which also indicates the transfer request, the other party In addition, the connection time for the search time is extra, and the user is not made aware of the delay time due to the data transfer as much as possible.

The data update process is triggered by the user's communication request, but the actual transfer from the center to the terminal starts when the user's communication ends. Further, when there is an incoming request to the terminal during the execution of the transfer process or when a new communication request is generated, the transfer process is temporarily stopped and the user's request is prioritized. Therefore, the user can normally access without being aware of the data transfer, and the communication request of the user is not affected by the system maintenance operation.

2. Effect on system operator Update data need only be input to a center installed in one place on the network. The center reconstructs the database from the newly input data, automatically generates the difference data for the management number, and stores it together with the management number. In addition, at this time, each node is notified that the data has been updated along with the new management number so that it can be used for the update judgment at the time of subsequent request from the terminal, and the data of the terminal that sequentially requested Can be updated. In this way, for the system operator, maintenance can be improved because the required terminal terminals are automatically updated with new data only by inputting data to the center.

Regarding the telephone directory data held by the terminal, the system automatically determines whether or not the latest data is held by the management number transferred when the terminal is used, in addition to the transfer request from the user. , It has a function of transferring data when they do not match. As a result, the maintainer does not need to be aware until the telephone directory held on the terminal side is updated, so that the system operator does not need to maintain each terminal.

The network holds data for performing data transfer only when requested by the terminal, and the actual transfer is executed while the terminal is not used,
Since the amount of data to be transferred is only the difference with respect to the data currently held by the terminal, and since it has a function to edit the difference data only for the final result for multiple changes of the same terminal, Transfer triggers can be distributed, unnecessary data transfer that is not used can be suppressed as much as possible, and even if the number of terminals in the network increases, it is not necessary to be aware of the effect of data transfer for maintenance, and network design can be performed. .

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following measures are taken in the automatic updating function of the terminal-owned telephone directory of the present invention.

1. Ensuring real-timeness Measures to improve hit rate when accessing a new terminal (method of determining transfer necessity) There is a difference between the access time of registered terminals and the access time of unregistered terminals by the time required for search work.

Therefore, it is possible to recognize how a difference has already occurred, and once it is recognized that there is a difference, update the data before accessing another unregistered terminal. As a result, it is possible to shorten the time for subsequent access with one trigger.

For this reason, when a call request to an unregistered terminal is recognized, a function to send the fact to the database center, transfer the difference data after the communication request is completed, and update the data held by the terminal. Equipped with.

Measures for shortening difference in access time between unregistered terminal and registered terminal Shortening the time difference between the start of communication between a registered terminal and an unregistered terminal and executing data update to prevent the effect on users as much as possible. Therefore, when communication is requested, the function that prioritizes and executes the connection of communication, the function that monitors the end of communication to start the data update processing when the communication ends, and the fact that the difference data must be transferred is stored. And a function of transferring data to a terminal that needs updating at the end of communication.

2. Securing throughput in the network Measures to reduce the number of transfers (trigger determination method) Do not reduce the throughput as a network by reducing the data transfer from the center as much as possible.
For this reason, the management data of terminals, nodes, and centers are arranged hierarchically, with the data body and the management number indicating the creation time for the terminal, only the management number for the node, and the latest data body and management number for the center. And the difference data corresponding to the control number is provided. Using them, the trigger for transfer is that there is a communication request from the terminal, that the number of the other party included in the communication request is not mounted on the terminal side, and that the management number information from the terminal is Different from the latest version managed by the node, the transfer operation is performed only when the above three conditions are satisfied.

Thus, if the communication requester wants to connect to a destination other than a newly added terminal in the network, it is determined that new data is not needed for that terminal, and even if the management version number is exceeded. Data will not be transferred even if there is a difference. This is because data transfer is activated only when it is really needed. As a result, for terminals that are not particularly needed, the results of data updates performed a plurality of times during that time are collectively updated when they are actually needed. As a result, first, the update operation activation can be distributed to each terminal, and the number of activations of the connection processing for transfer is reduced.

Reduction Measure of Transfer Contents (Differential Format) When it is recognized that there is a difference between the terminal-owned data and the center-owned data, only the difference data is transferred. This recognition is performed by the node accommodating the request terminal based on the management number. The update process is performed by the center based on the management number sent from the node. At this time, the center manages a plurality of management numbers and difference data for the management numbers, and transfers only necessary difference data to the terminal. Even when the same terminal is changed a plurality of times between the management number and the current latest data, only the final data is determined to be transferred, for example, when the number is changed twice.
Also, all data is updated only when the management number is old data that is not managed by the center.

As a result, the reduction of the transfer data amount due to the difference and the reduction of the invalid data transfer due to the content comparison between the difference data are executed.

Next, one embodiment of the automatic updating function of the terminal-owned telephone directory of the present invention will be described. FIG. 1 shows the configuration of a system applied to the automatic updating function of a terminal-owned telephone directory of the present invention.

The constituent devices and functions will be described with reference to FIG. 1. The basic function of the terminal 1-01 is to perform mutual exchange of low speed to high speed data signals with other terminals in the network. That is. In order to select a communication partner, a logical identifier for a terminal in the network and the network are correspondence tables of the accommodations with telephone numbers, which are physical identifiers of the nodes 1, 2, 3 and lines. It has a telephone number book and its management number. Also, it is possible to communicate with a plurality of different parties at the same time. In addition to the mutual communication function, it has a function of connecting a manual telephone book data request from a user to the center of the reception database, receiving the latest data and management number from the center 1-03, and storing them in the terminal.
It also has a function of accepting communication for data update from the center 1-03 and similarly updating the stored telephone directory data.

Reference numeral 1-02 is a switching device for connecting communication between terminals. The switching device 1-02 has a connection function to the other party based on the physical identification information sent from the terminals and the center 1
The latest management number of the telephone number book managed by -03 is stored.

The center 1-03 is a database center for centrally managing telephone number book data, receives a data update request from a maintenance person, assigns a management number based on the input information, and updates the database. In addition to the function to perform and the latest data, it also has the function to create update history information from the past several generations. It also has a function of notifying that the change has been implemented by transmitting the latest management number to each of the nodes 1, 2, and 3.

FIG. 2 shows the format of data managed by the center 1-03. 2-01 indicates the latest data item. The management item is the latest data of the management number and the data body. Reference numeral 2-02 indicates a management format of difference data. The change number instructed at that time is stored together with the management number for the past several times. If a change is made to the same terminal, the information about the corresponding terminal stored in the previous change content may be deleted after it is determined to be valid or invalid.

FIG. 3 is a diagram showing how the devices constituting the system store the data in the present invention. As shown in Fig. 3, the "terminal" has a phonebook "data body".
And one "control number" are retained. The "node" stores the latest "management number", and the "center" stores the "base body" of the latest telephone directory data and "difference data" and "management number" associated with multiple changes in the past. .

Next, the simplest method of updating the database according to the present invention will be described with reference to FIG.

Reference numeral 4-01 indicates original data (original data). The database management items are A, B, and C.
Item A is the index key, and items B and C are the data contents.

Last-before-update request 4-02, last-update request 4
-03 and the immediately preceding update request 4-04 indicate the contents of each of the three change requests, and the previous update request 4-02 indicates that the record AAAA5 is added and the index key of the existing record AAA3 is changed to AAA6. Shows. Similarly, the previous update request 4-03 is the previously changed AAAA3.
BB in item B of the record (AAA6 at this point)
It indicates that the BB6 is changed. Last update request 4
Similarly for -04, a new record AAAA3 is added (change 4
The record having the index key AAAA3 due to -02 is no longer present at this point) and the record AA changed last time
This indicates that item B of AA6 is changed to BBBB3 again. That is, the previous change is invalid.

As a result of these three changes, the latest database content currently held by the center 1-03 is the latest data 4-0.
It is 5. Further, the change history data shown in FIG. 2 becomes the difference data 4-06 two times before and the difference data 4-07 last time to the difference data 4-08 immediately before.

The pre-previous difference data 4-06 is a terminal that has not received a transfer request even once during these three changes, that is, a terminal that holds data in the form of the original data 4-01. Is the difference data for. Previous data 4-07
Is the difference data 4 before the last time for the terminal that made the update request once after the change of the before-the-second update request 4-02.
-06. The immediately preceding difference data 4-08 shows the immediately preceding difference data 4-08 for the terminal that has issued the update request after the changes up to the previous update request 4-03 were made. In either case, the difference data is created by performing processing on the center 1-03 side so that invalid data that has been updated again is not transferred during the course of the update processing on the way. Which data to transfer is determined by the management number sent from each terminal.

When the management number before this is sent, the latest data 4-05 is transferred because the center 1-03 does not hold the difference data. The number of generations of difference data can be determined by the capacity of the storage device of the center 1-03, the frequency of data update, and the frequency of terminal usage. When the data update is executed, the center 1-03 notifies each node 1, 2, 3 of the latest management number and is stored.

Next, the data flow at the time of data registration will be described with reference to FIG. The portion enclosed by <> above the arrow used in FIGS. 5 to 7 indicates a main information element in the notification information.

First, when the database is updated in the center 1-03 by the data update registration 5-01,
By the data update notification 5-02, the center 1-03 notifies the respective nodes 1, 2, 3 that the data has been updated. Each of the nodes 1 and 2 updates the management number information managed respectively by a management number update 5-03.

Next, the case of a direct update request from the terminal will be described. When the user explicitly requests the data update by the update request 5-04, the terminal sends a manual update request notification to the center 1-03. At this time, the <management number> managed on the terminal side is notified and used for the differential data search in the center 1-03. The node 1 which relays the manual update request at 5-05 collates the <management number> managed by itself with the <management number> sent from the terminal. If these two management numbers match, the terminal side already holds the latest data, so the transfer request is not sent to the center, a transfer completed indication is added, and a response is returned to the terminal side. To do.

By this collating operation, an invalid transfer request can be prevented. It should be noted that this collation can be designated to forcibly execute the transfer request from the center 1-03 instead of being executed by an instruction from the terminal. Difference data search 5-
The center 1-03, which receives the transfer request according to 06, interprets it as an immediate transfer request, retrieves the difference data history information by the transferred <management number>, retrieves the data to be transferred from the database, Differential data transfer 5-07
The transfer operation toward the requested terminal is started. At this time, the latest management number <difference data, latest management number> is notified together with the difference data. The terminal receiving these data by the data update 5-08 updates the management number together with its own database, and thereafter uses this data to make a communication request.

Next, the function of updating the automatic telephone directory, which is the core of the present invention, will be described with reference to FIG. Connection instruction 6-01
Thus, the user of the terminal A makes a connection request 6-02 to the network by a general partner connection operation. When selecting a partner, the normal usage is to use the phonebook of the terminal to select the partner. Here, it is assumed that the number of the other party has been changed and the telephone directory on the terminal side does not reflect the information. In this case, the old number before the change is introduced from the telephone directory searched on the terminal side and transmitted to the node in the signal of the connection request 6-02 together with the management number on the terminal side <destination information, management number>. The node side tries to select the connection destination from the number sent by 6-03, but since the corresponding number is the number before the change, the other party cannot be determined.

If the number has not been changed, the node makes a normal destination selection (normal connection) at 6-04,
Perform connection processing. In this case, the function ends here and the management number of the phonebook is not checked. This is because it is assumed that the new phonebook is not required for the user of terminal B for the time being, so it is invalid. This is to prevent data transfer.

When it is determined in 6-05 that the node does not have the corresponding number, the management number sent from the terminal is collated. When this management number matches the latest management number held by the node, the normal missing number processing is performed in the procedure of 6-07. This obviously corresponds to the case where the user wrongly inputs the number.

When the node determines that the terminal management number is old in inquiry 6-08, it makes an inquiry to the center. At this time, the management number is transferred together with the destination information sent from the terminal <destination information, management number>. Based on this information, the center side searches the difference history information for each management number in the process of database search 6-09, and confirms which information in the latest database this partner information of the management number corresponds to. Then, the information is returned to the node side as a response. In this case, the new terminal number after the change is <new destination information>. The node that receives the new number in the storage request 6-10 performs registration for executing the update processing of the telephone directory information after the communication is completed. In 6-11, normal connection processing (normal connection) is performed based on the new number information, and as shown in FIG.
In the transfer waiting 6-12, after the communication is completed, a waiting state for transferring is entered.

When the user terminates the communication 6-13, the terminals A and B are disconnected and the node confirms that there is no other connection request for the terminal, and then the center is sent to the center to update the telephone directory information. In response, the terminal number to be updated and the management number of the telephone directory currently held by that terminal are transmitted <Terminal A
Number, terminal A management number>.

In the center which has received such information in the differential data search 6-15, the corresponding differential data is searched in the differential data transfer 6-16, a connection request is made to the transfer destination terminal, and the difference data, latest Transfer the management number <difference data, latest management number>.

In the data update 6-17, when the terminal recognizes that it is the transfer request of the telephone directory data from the center, it automatically responds without receiving the user's intervention and receives the transfer data. Update the held database.

When a new incoming call request or a outgoing call request from the user is made during transfer, it is possible to suspend the processing and give priority to those requests. On the center side,
It has a function to judge continuation of the transfer process based on the information from the terminal. In addition, the terminal side is provided with a storage device area capable of receiving difference data in addition to the database currently held so as not to hinder the use during updating.

[0057]

The first effect of the present invention is to improve the operability of the user.

1. Usually, the update of the telephone directory database held in the terminal is automatically determined from the procedure of using the terminal and the update process is executed, so that the user does not need to be aware of the transfer trigger.

2. By separating the judgment of the transfer opportunity and the actual transfer process, the original communication purpose of the user is given priority,
First, to complete the service and then execute the update process,
This is to minimize the difference in access time in actual connection depending on the presence or absence of data registration.

3. By performing priority control between the update data transfer and the user's original use of the terminal, normal access is possible without being aware of the transfer.

The second effect of the present invention is to improve the maintainability of the network operator.

1. Although it is necessary to update the telephone directory database held in each terminal as the number of terminals is increased or decreased or moved in the entire network, the present invention updates only the telephone directory database managed by the center. If this is done, each node and terminal will automatically request updates as needed, so the maintenance points can be limited, and maintenance of each terminal with a large number of installations is unnecessary.

2. Also regarding the data for update, the transfer time of the data itself can be reduced by managing the unified management number and the difference between the original data corresponding to the management number and the latest data. Also, with regard to the transfer trigger, it is not transferred if there is a difference, but it is transferred at the stage when it is necessary, so the number of updates itself can be reduced. As a result, it is not necessary to consider the load due to the network management signal in the network design.

[Brief description of drawings]

FIG. 1 is a network configuration diagram showing a connection relationship between devices constituting an automatic updating function of a terminal-owned telephone number book of the present invention.

FIG. 2 is an image diagram of a database managed by a center that constitutes an automatic updating function of a terminal-owned telephone number book of the present invention and a configuration diagram showing a method of retaining change history information.

FIG. 3 is a diagram showing the arrangement of main data of the automatic updating function of the terminal-holding telephone number book of the present invention among devices.

FIG. 4 shows an embodiment of an automatic updating function for a terminal-owned telephone number book of the present invention, and how the difference data for each management number is configured for a specific data image and changing operation. Is shown.

FIG. 5 is a diagram showing an information flow between devices constituting the present invention, showing a case where a maintenance person updates data in the center;
The flow of information when a data update request is explicitly issued from the terminal and a brief operation outline of each device are shown.

FIG. 6 shows an information flow diagram similar to that of FIG. 5, showing the operation of automatic updating of the database of each terminal, which is the main part of the present invention.

FIG. 7 shows an information flow diagram following FIG.

[Explanation of symbols]

 1-01 Terminal 1-02 Switching device 1-03 Center 2-01 Data body 2-02 Difference data management method 4-01 Original data 4-05 Latest data

Claims (4)

[Claims] 1. The number of nodes and the number of terminals accommodated under the nodes are limited to a level slightly exceeding the average human storage capacity, and there is a center that can be logically connected from all terminals in the network. In the automatic updating function of the terminal-owned telephone number book applied to the small-scale network installed for the purpose of connecting between the terminals, it is possible to rewrite the destination identification information necessary for the connection regarding all the terminals accommodated. A terminal equipped with such a storage device and realizing a method of selecting from the telephone number book as a method of selecting a connection destination and a method of directly inputting the destination number stored by the user,
The terminal has a function of identifying whether or not the destination terminal designated in response to the connection request from the terminal exists in the network. If the terminal does not exist, the terminal is connected to update the telephone number book. Managing a node having a function of notifying that there is a required terminal, and a database of the telephone number book regarding all terminals existing in the network,
It has a function of centrally adding, changing, and deleting information for identifying the terminal, and stores the telephone number book held in the system configured by the center that can access all terminals via a node. An automatic update function for the phone number book held by the terminal, which has the function of automatically judging and updating without user intervention. 2. The automatic updating function of the terminal-owned telephone number book according to claim 1, wherein the time difference between the start of communication between a registered terminal and an unregistered terminal is shortened, and data update is executed to the user. In order to prevent the influence as much as possible, it is necessary to prioritize the connection of communication at the time of communication request and execute it, monitoring function of communication end to start data update processing at the end of communication, and transfer of difference data. An automatic update function of a terminal-owned telephone number book, which is provided with a function of storing a message and a function of transferring data to a terminal that needs to be updated at the end of communication. 3. The automatic updating function of a terminal-owned telephone number book according to claim 1, wherein the arrangement of management data of the terminal, the node, and the center is hierarchized, and the terminal shows a data body and its creation time. The management number, only the management number for the node, the latest data body, the management number, and the difference data corresponding to the management number are provided in the center, and these are used to trigger the transfer from the terminal. There is a communication request, the destination number included in the communication request indicates that it is not implemented on the terminal side, and the management number information from the terminal is different from the latest version managed by the node. Automatic update function of the telephone number book held by the terminal, which is characterized in that the transfer operation is performed only when the three conditions are satisfied. 4. When the automatic update function of the terminal-owned telephone number book according to claim 1 recognizes that there is a difference between the terminal-owned data and the center-owned data, only the difference data is transferred. , This recognition is performed based on the management number in the node accommodating the requesting terminal. The updating process is performed at the center based on the management number sent from the node. At this time, the center manages a plurality of management numbers and difference data for the management numbers, and transfers only necessary difference data to the terminal. However, even if there are multiple changes to the same terminal between the management number and the current latest data, it is determined that only the final data is transferred, and the management number is old data not managed by the center. The automatic update function of the telephone number book possessed by the terminal, which updates all data only by reducing the transfer data amount due to the difference and prevents the invalid data transfer by comparing the contents of the difference data.