JPH07160602A - Transfer data control system and host to terminal data transfer system - Google Patents

Abstract

PURPOSE:To effectively secure the margin of a data file in accordance with change of the quantity of data transferred between a host computer and a terminal equipment and also to flexibly deal with increase of types of data. CONSTITUTION:A host computer 1 is provided with a data file 11 consisting of a standly connection organizing file and a control file 10 consisting of an index order organizing file. Then the computer 1 stores both transfer data on each user group which are sent from and to a terminal equipment 2 in different subfiles of the file 11 for each user group. The control information on these fransfer data stored in the subfiles, e.g. the attributes of the identifier, the subfile name, the data name, the number of items, etc., of each user group are stored in the control records of the file 10. Thus the transfer data can be controlled for each user group.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transfer between a host computer and a terminal device connected by a communication line, and more particularly to a system for managing transfer data and a host-terminal data transfer system.

[0002]

2. Description of the Related Art In a system including a host computer and a plurality of terminal devices connected thereto via a communication line, the plurality of terminal devices are divided into several groups (user groups), and each host computer In the case of managing the data transferred from the terminal device to the host computer and the data transferred from the host computer to the terminal device for each user group, the following method has been conventionally used.

First, a management file 1800 as shown in FIG. 18 and a data file 1900 as shown in FIG. 19 are prepared on the host computer side.
As for 900, a file area is allocated in advance for each user group by a record number as shown in FIG. Then, in the management file 1800 of FIG. 18, for each user group, a key for identifying the user group, the record numbers of the start and end of the allocated file area of the data file 1900, and reception management In this case, the start and end record numbers of the received data and the processing state of the data, and the transmission management, the start and end record numbers of the data to be transmitted and the processing state of the data are managed.

When the host computer receives the data sent from the terminal device, first, the user group of the data transfer source is judged to search the management file 1800,
The information about the file area of the data file 1900 assigned to the user group is obtained, and the data received from the terminal device is written in the available area. At this time, the processing state of "reception completed" is added to the received data on the management file 1800. When performing some processing on the received data by the host computer, the record number of the data in the “reception completed” processing state on the management file 1800 is checked, and the data is extracted from the data file 1900 for the purpose. And the above processing state is changed to “extraction completed”. After extracting all the data, the management file 1800 is initialized to return the data file 1900 to a reusable state.

On the other hand, when data is transmitted from the host computer to the terminal device in response to the data transmission request from the terminal device, first, the user group of the data transfer destination is determined and the management file 1800 is searched for. When information about the file area of the data file 1900 assigned to the group is obtained and data to be transmitted exists, records from the start to the end of the data are read from the data file 1900 and sent to the requesting terminal device. Send. Then, when transmission of all data is completed, the management file 1800 is initialized and the data file 1900 is returned to a reusable state.

[0006]

Although it is possible to manage the transfer data for each user group in the host computer even with the above-mentioned conventional method, it is necessary to allocate the area of the data file 1900 for each user group. Therefore, it is necessary to strictly estimate the amount of data for each user group. Therefore, it is necessary to secure a margin for each user group with respect to a change in the amount of transmitted / received data, resulting in a large amount of wasted space. If the wasted space is reduced as much as possible, the amount of data increases, so that it becomes necessary to frequently review the capacity of the entire data file, and each time, work such as initialization of the file becomes necessary.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to efficiently secure a data file margin for a change in data amount and to flexibly cope with an increase in the number of data types.

[0008]

In order to achieve the above-mentioned object, a transfer data management system of the present invention is a system including a host computer and a plurality of terminal devices connected to the host computer by a communication line. The host computer side is provided with a data file composed of a standby binding organization file and a management file composed of an index sequential organization file, and the transfer data or // for each user group transmitted from the terminal device to the host computer.
And transfer data for each user group to be transmitted from the host computer to the terminal device are stored in different subfiles in the data file for each user group, and management information of the subfile and transfer data is stored. The management file is stored in the management record.

The host-terminal data transfer system of the present invention connects the host computer to the host computer via a communication line so that the host computer can manage the data received from the terminal device in units of user groups. In a system including a plurality of terminal devices, each terminal device side is provided with a transmission data transfer processing unit that specifies a user group and transmits transfer data to a host computer, and the host computer side has a standby connection organization. A data file composed of files, a management file composed of index sequential files, and transfer data transmitted from the terminal device by designating a user group are stored in one sub file created in the data file. In addition to storing the management information of the sub file and transfer data, So that a receiving processing unit for storing the management record created yl.

Further, the host-terminal data transfer method of the present invention enables a host computer and a communication line to be connected to the host computer in order to enable the host computer to transmit the data managed by the user group unit to the terminal device. In a system including a plurality of terminal devices connected with each other, to each terminal device side, a transmission request record designating reception desired data is transmitted to the host computer, and the data transmitted from the host computer in response to this is transmitted. A reception data transfer processing unit for receiving is stored, and transfer data for each user group, which is composed of a standby connection organization file and is to be transmitted from the host computer to the terminal device, is stored as one subfile on the host computer side. It consists of a data file and an index sequential file. A management file in which management information of a corresponding subfile and transfer data is stored in a management record corresponding to each subfile of the data file, and reception in the transmission request record received from the terminal device. Receiving desired data from the data file by referring to the management record in the management file relating to the desired data, recognizing the subfile storing the desired data, and transmitting the data stored in the subfile to the terminal device. And a processing unit.

[0011]

The standby join organization file is (1) a large number of homogeneous files, that is, subfiles
Manage as a single file. (2) The file has a directory for managing subfiles. (3) When an individual subfile is deleted, its used area is released, and the released area can be reused as another subfile. There are features such as. In the present invention, such a standby join organization file constitutes a data file, while the management file comprises an index sequential organization file, and the host computer assigns to each user group transmitted from the terminal device. The transfer data and the transfer data for each user group to be transmitted from the host computer to the terminal device are stored in different subfiles in the data file for each user group, and the subfile and the transfer data are stored. By storing management information, such as user group identifiers, subfile names, data names, and attributes such as the number of records in a management record in the management file, transfer data is managed for each user group.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of a system to which the present invention is applied. The system of this example includes a host computer 1 and a plurality of terminal devices 2 connected to the host computer 1 through a communication line. The host computer 1 receives and uses data sent from each terminal device 2. The host computer 1 is configured to send the data managed by the host computer 1 in the user group unit to each terminal device 2 in response to a request from each terminal device 2.

In the present embodiment, the host computer 1 has a management file 10 commonly used for transmission / reception data.
And a data file 11 are provided. Here, the management file 10 is composed of an index sequential organization file, and the data file 11 is composed of a standby combined organization file. Further, a reception processing unit 12 and an extraction processing unit 13 are provided as functional units related to the reception of data from the terminal device 2, and a storage processing unit 16 and an index transfer are provided as functional units related to the transmission of data to the terminal device 2. The unit 17 and the transmission processing unit 18 are provided. In addition, 14 indicates the extracted data extracted from the received data, and 15 indicates the stored data which is the data to be transmitted to the terminal device 2.

On the other hand, each terminal device 2 is provided with a transmission data transfer processing section 21 as a functional section related to the transmission of data to the host computer 1, and the host computer 1
An index processing unit 25 and a received data transfer processing unit 26 are provided as functional units related to reception of data from. In addition, 20 is transmission data to be transmitted to the host computer 1, 22 is a display device such as a CRT display, 23 is an input device such as a keyboard, and 24 is temporary index information sent from the host computer 1. Reference numeral 27 indicates an index temporary storage file to be stored, and reference numeral 27 indicates received data received from the host computer 1, respectively.

Hereinafter, the host computer 1 is the terminal device 2
When receiving data from the host computer 1
The detailed functions of the respective units will be described together with their operations, separately from the case of transmitting data to the terminal device 2.

In FIG. 2, the host computer 1 is a terminal device 2
FIG. 3 is an operation explanatory diagram when receiving data from the device, the same reference numerals as those in FIG. 1 denote the same parts, and 201 to 204 denote records transmitted between the terminal device 2 and the host computer 1. The arrows attached to the left or right of each of the records 201 to 204 indicate the transmission direction of the record. Reference numeral 205 is a management record, 206 and 207 are subfile directory parts and data parts, and 208 is a subfile that is a combination of both.

In FIG. 2, the transmission data transfer processing unit 21 of the terminal device 2 starts the processing shown in FIG. 3 when transmitting the transmission data 20 to the host computer 1, and first, the user to which the own terminal belongs. The header record 201 including the group identifier is transmitted to the host computer 1 (S1). Then, it waits for the transmission permission record to be transmitted from the host computer 1 (S2).

The header record 201 is received by the reception processing unit 12 of the host computer 1. Reception processing unit 1
2 receives the header record 201, starts the process shown in FIG. 4, and first creates one management record 205 in the management file 10 with a predetermined key value (S11).

In the case of the present embodiment, the predetermined key value is the character R30 indicating the received data as shown in FIG.
1, a key value 300 composed of a user group identifier 302, a data reception start date / time 303, and an input terminal name 304 included in the header record 201 is adopted.
Note that the user group identifier 302 alone is 1
It will be one key.

Further, the reception processing unit 12 uses the management record 20.
Subsequent to the creation of No. 5, one subfile 208 is created in the data file 11 with a predetermined subfile name (S
12). That is, as shown in the data file 11 of FIG. 2, a directory portion 206 of the subfile is created with a predetermined subfile name and the directory portion 20 is created.
The data part 207 of the sub file designated by the command No. 6 is created.

In this embodiment, as the predetermined subfile name, the key value 300 itself of the management record 205 shown in FIG. 5 or the number of digits of the key value 300 within the range where duplication does not occur. The deleted file is used as the subfile name.

After the above processing, the reception processing unit 12 transmits the transmission permission record 202 including the permission of transmission to the terminal device 2 (S13), and waits for the record from the terminal device 2 (S14). ).

The transmission data transfer processing unit 21 of the terminal device 2
Is a transmission permission record 202 from the host computer 1.
When it receives, the data record 203 forming the transmission data 20 is transmitted to the host computer 1 (S3).
When the transmission of all data records 203 is completed, the end record 204 including the number of transmitted data records
Is transmitted to the host computer 1 (S4), and the processing of FIG. 3 is completed.

Reception processing unit 12 of host computer 1
Receives a data record 203 from the terminal device 2 in a state of waiting for a record from the terminal device 2 (S15), the sub file 208 created in the process S12.
The received data record is written in (S16). When the end record 204 is received subsequently to the series of data records, the data record 2
03 and the number of transmissions included in the end record 204 are collated, and if they match, the number and the processing result such as “reception completed” are written in the management record 205 created in the processing S11 (S17), and FIG. Ends the process. If the numbers of cases do not match, the processing result indicating that fact is written in the management record 205.

If any situation in which the processing cannot be continued occurs during the above processing, either the terminal device 2 or the host computer 1 transmits a record for instructing the processing interruption, and the reception processing unit 12 By management record 2
The contents according to the situation are stored in the processing result of 05.

As described above, the data which has been normally received is stored in the extraction processing unit 1 of the host computer 1 thereafter.
3 is appropriately extracted from the data file 11 and is passed to the target process as the extracted data 14.

In the present invention, the management file 10 is composed of index sequential files, and each management record 20
Since the user group identifier is included in the key value 300 of 5, the extraction processing unit 13 uses all the various accesses such as sequential access, random access, and partial sequential access of the index sequential files. Various extraction processes such as a process of extracting data of, a process of extracting only one specific data, and a process of extracting all data of a specific user group can be performed.

The process of extracting all the data is performed by sequentially reading all the management records of the received data by using sequential access, and an example of the process is shown in FIG. As shown in the figure, the extraction processing unit 13
In the order of keys from the management file 10 (however,
When the management record 205 is read one by one (S21) and the processing result is "reception completed" (YES in S23), the processes S24 to S2 are performed.
Execute 7. That is, the key value 30 of the management record 205
The corresponding subfile name is recognized from 0 (S24), the subfile 208 having the recognized subfile name is searched from the data file 11 (S25), and the data is extracted from the searched subfile 208 (S26). ,
The subfile 208 and the management record 205 that have been extracted are deleted (S27). The above processing is repeated for all management records related to the received data, and when it is determined in step S22 that all the corresponding management records have been processed, the processing of FIG. 6 ends.

The process for extracting the only specific data is performed by directly positioning the specific management record by using random access, and an example of the process is shown in FIG. As shown in the figure, the extraction processing unit 13
The management record 205 related to the specific received data (user group identifier, data reception start date and time, data specified by the input terminal name) of interest is searched from the management file 10 (S31), and the search is successful (S32). YE
S) and if the processing result in the management record is “reception completed” (YES in S33), the processing in S24 to FIG.
The same processing as S27, that is, S34 to S37, is executed to extract the target data.

Furthermore, the process of extracting all the data of a specific user group is to position it at the beginning of the management record of the target user group and continue the extraction process until the user group changes from there. An example of FIG.
Shown in. As shown in the figure, the extraction processing unit 13 first
The first management record of the specific user group to be noted is read from the management file 10 (S41), and if the processing result in the management record is "reception completed" (S42).
YES), regarding the management record, from S24 of FIG.
The same processes S43 to S46 as S27 are executed to extract the target data.

Then, does the management record after the positioned management record end (S48)?
YES), or until the user group identifier described in the management record is changed to another user group identifier (NO in S49), one by one from the management file 10 in the order of the keys in the management record 205. Is read (S47), and the management record 205 whose processing result is "reception completed" (YES in S50), the processing S2 in FIG.
Target data is extracted by performing the same processing S51 to S54 as 4 to S27.

Next, the host computer 1 turns the terminal device 2 into
The operation of transmitting data to the terminal will be described with reference to FIG. In the figure, the same reference numerals as those in FIG. 1 denote the same parts, 901 is a management record, 902 and 903 are subfile directory parts and data parts, and 904 is a combined subfile.

In the stored data 15 to be transmitted to the terminal device 2 in the host computer 1 in FIG. 9, as shown in FIG. 10, immediately before the data 1005 for each user group, the user group identifier 1001 is displayed. , Data ID1
A header record 1000 including information such as 002, display data name 1003, and receiving device file name 1004 is added.

Storage processing unit 16 of host computer 1
Is a part that performs a process of storing the stored data 15 to be transmitted to the terminal device 2 in the data file 11, and executes a process as shown in FIG. 11. That is, first, the stored data 15
Pay attention to the first header record 1000 in the middle (S
61), create a management record 901 in the management file 10 with a predetermined key value based on the content of the header record 1000 (S63).

In the case of the present embodiment, the predetermined key value is the character S13 indicating the transmission data as shown in FIG.
01, a user group identifier 1302 included in the header record 1000, a data storage date / time 1303, and a key value 1300 including a data ID 1304 included in the header record 1000. here,
User group identifier 1302, data ID 1304
Is a key by itself.

In the management record 901, in addition to the key value 1300 shown in FIG. 13, the data name, the number of cases, the processing result indicating whether transmission is possible, the device used when the terminal device 2 receives, File names are also managed.

Following the creation of the management record 901, the storage processing unit 16 creates a subfile 904 in the data file 11 with a predetermined subfile name (S64). That is, as shown in the data file 11 of FIG. 9, the directory portion 90 of the subfile is stored with a predetermined subfile name.
2 is created, and the data part 903 of the subfile specified by the directory part 902 is created.

Here, as the predetermined sub-file name, in the case of the present embodiment, the key value 1300 itself of the management record 901 shown in FIG. 13 or the number of digits of the key value 1300 within the range where duplication does not occur. The deleted file is used as the subfile name.

Then, the storage processing unit 16 retrieves the data record 1005 from the currently focused header record to the next header record, or the data record up to the last data record if there is no such next header record. The management record 901 stored in the subfile 904 created in step S64 and created in step S63
Information such as the data name, the number of cases, the processing result indicating whether transmission is possible, the device used when receiving by the terminal device 2, the name of the file, etc. are set (S65).

The storage processing unit 16 repeats the above-described processing for the series of data records 1005 to which each header record 1000 is added, and finishes processing all the header records in the stored data 15 in processing S62. When the judgment is made, the processing shown in FIG. 11 is ended. This allows
The stored data 15 is ready for transmission.

On the side of the terminal device 2, prior to the actual data reception process, the index processing unit 25 is activated by an instruction from the input device 23 by the user, and the index processing unit 2 is activated.
As shown in FIG. 12, reference numeral 5 is a host computer 1
An index transfer request is transmitted to the index transfer unit 17 of the user by designating its own user group identifier (S71), and the host computer 1 waits for the index information to be sent (S7).
2).

Index transfer unit 17 of host computer 1
1 receives the index transfer request from the terminal device 2,
The process shown in FIG. 4 is started, and first, based on the user group identifier specified in the transfer request, all management records for managing data to be sent to the user group are read from the management file 10 (S81), Next, index information is created by collecting necessary information such as the key value 1300 and data name in the read management record, and this is sent to the terminal device 2 (S82).

When the index processing unit 25 of the terminal device 2 receives the index information transmitted from the host computer 1, the index processing unit 25 stores the index information in the index temporary storage file 24 and displays it on the screen of the display device 22 for the user. And prompts the user to select the data to be received or the data to be deleted (S73). Then, when the user selects the data to be received on the screen by operating the input device 23, the index processing unit 25 extracts the key for specifying the selected data desired to be received from the index information corresponding to the data and receives the key. Data transfer processing unit 26
Is notified (S74), and the processing shown in FIG. 12 ends. When the user selects the data to be deleted, the index processing unit 25 extracts the key for identifying the selected data desired to be deleted from the index information corresponding to the data and notifies the received data transfer processing unit 26 of the extracted key ( S74), and the process shown in FIG. 12 is terminated.

When the received data transfer processing unit 26 is notified by the index processing unit 25 of a key for specifying data, the received data transfer processing unit 26 will be described with reference to FIG.
When the data reception is desired (YES in S91), the key shown in FIG. 17 for specifying the notified data is included as the key 1702 of the data to be requested to be transmitted, and the request is to be transmitted to it. The transmission request record 1700 to which the reference numeral 1701 indicating is added is transmitted to the transmission processing unit 18 of the host computer 1 (S92). And
The host computer 1 waits for a record to be sent (S93), and when the record is sent, the send data is extracted from the record to create the receive data 27 (S94).

On the other hand, if data deletion is desired (S91: N
O), the reception data transfer processing unit 26 includes a key for specifying the notified data as a key 1705 of the data requesting deletion, as shown in FIG. 17, and added a reference numeral 1704 indicating that it is the deletion request. Delete request record 1
703 is transmitted to the transmission processing unit 18 of the host computer 1 (S95), and the processing of FIG. 15 is finished.

Transmission processing section 18 of host computer 1
When receiving the transmission request record or the deletion request record from the reception data transfer processing unit 26 of the terminal device 2,
When the process shown in FIG. 6 is started and the transmission request record 1700 is received (YES in S101), the management record 901 of the data requested to be transmitted from the management file 10 based on the key 1702 included in the transmission request record 1700.
Is searched (S102). And the management record 901
If the processing result in the middle is in a transmittable state (Y in S103)
ES), the corresponding subfile name is recognized from the key value 1300 of the management record 901 (S104), the subfile 904 having the recognized subfile name is searched from the data file 11 (S105), and the searched subfile is searched. The data is read from 904 and transmitted to the terminal device 2 (S106). On the other hand, the retrieved management record 90
If the processing result in 1 is not in a state where transmission is possible (S103
NO), for example, an error is notified to the terminal device 2 (S1
07).

When the deletion request record 1703 is received (NO in S101), the transmission processing section 18 uses the key 1705 included in the deletion request record 1703 to manage the management record 901 of the data requested to be deleted from the management file 10. And delete this management record 901 together with the corresponding subfile 904 (S10).
8).

If any situation in which the processing cannot be continued occurs during the above processing, a record instructing the processing interruption is transmitted from either the terminal device 2 or the host computer 1, and the processing ends abnormally. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various other additions and modifications can be made. For example, the management file and the data file may be separately provided for transmission and reception. Further, at the time of the extraction processing unit, the subfile and the management record from which the data has been extracted may not be deleted, but may be collectively deleted at a later time.

[0051]

As described above, according to the present invention,
The following effects can be obtained.

Since a data file composed of a standby join organization file is used and transfer data for each user group is stored in a different sub-file in the data file for each user group, standby join By utilizing the characteristics of the organization file, it is possible to efficiently secure the data file margin against changes in the amount of data, and to flexibly cope with the increase in the types of data.

If the area of the data file for each user group is managed by the record number as in the conventional case, the structure of the program for judging each area becomes complicated, but in the present invention, it is managed in subfile units. The area of the data file for each user group can be easily determined, and the program configuration can be simplified.

Using a management file composed of index sequential files, management information of each subfile in the data file and transfer data stored therein, that is, a key value including the identifier of the user group, this key value Since the attributes such as subfile name, data name, and number of items that can be derived from are stored in the management record in the management file, records can be accessed by various methods such as sequential access, random access, and partial sequential access. Taking advantage of the characteristics of the index sequential file, the host computer side extracts all the data, the process of extracting only one specific data, and the data of a specific user group for the data received from the terminal device. Various extraction processes such as a process of extracting all can be performed.

Since the index processing unit is provided on the terminal device side and the index transfer unit is provided on the host computer side, the user wants to call the index of the data desired to be received on the screen of the display device and receive it while referring to it. Data can be selected, and desired data can be received accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a system to which the present invention is applied.

FIG. 2 is an operation explanatory diagram when a host computer receives data from a terminal device.

FIG. 3 is a flowchart showing a processing example of a transmission data transfer processing unit of the terminal device.

FIG. 4 is a flowchart illustrating a processing example of a reception processing unit of a host computer.

FIG. 5 is an explanatory diagram of key values of a management record that manages received data.

FIG. 6 is a flowchart illustrating an example of processing of an extraction processing unit of a host computer.

FIG. 7 is a flowchart showing another example of the processing of the extraction processing unit of the host computer.

FIG. 8 is a flowchart showing still another example of the processing of the extraction processing unit of the host computer.

FIG. 9 is an operation explanatory diagram when the host computer transmits data to the terminal device.

FIG. 10 is a diagram showing a configuration example of data stored in a host computer.

FIG. 11 is a flowchart illustrating a processing example of a storage processing unit of a host computer.

FIG. 12 is a flowchart illustrating a processing example of an index processing unit of a terminal device.

FIG. 13 is an explanatory diagram of key values of a management record that manages transmission data.

FIG. 14 is a flowchart illustrating a processing example of an index transfer unit of a host computer.

FIG. 15 is a flowchart showing a processing example of a reception data transfer processing unit of the terminal device.

FIG. 16 is a flowchart illustrating a processing example of a transmission processing unit of a host computer.

FIG. 17 is a diagram showing a configuration example of a transmission request record and a deletion request record transmitted from the terminal device to the host computer.

FIG. 18 is an explanatory diagram of a conventionally used management file.

FIG. 19 is an explanatory diagram of a conventionally used data file.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Host computer 10 ... Management file 11 ... Data file 12 ... Reception processing unit 13 ... Extraction processing unit 14 ... Extraction data 15 ... Stored data 16 ... Storage processing unit 17 ... Index transfer unit 18 ... Transmission processing unit 2 ... Terminal device 20 ... Transmission data 21 ... Transmission data transfer processing unit 22 ... Display device 23 ... Input device 24 ... Index temporary storage file 25 ... Index processing unit 26 ... Reception data transfer processing unit 27 ... Reception data

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tofumi Fukuda 1-4-24 Jomi Chuo-ku, Osaka City, Osaka Prefecture Kansai NEC Software Co., Ltd. (72) Inventor Takahiro Kojima Minamihanadaguchi, Sakai City, Osaka Prefecture 2-15-cho, Osaka Izumi Civic Consumers' Co-op

Claims (9)

[Claims] 1. A system comprising a host computer and a plurality of terminal devices connected to the host computer by communication lines, wherein the host computer side comprises a data file composed of a standby binding organization file and an index sequential organization file. And a transfer data for each user group sent from the terminal device to the host computer or / and transfer data for each user group to be sent from the host computer to the terminal device. Transfer data management, characterized in that the data is stored in different sub-files in the data file for each user group, and the management information of the sub-file and transfer data is stored in the management record in the management file. method. 2. In a system including a host computer and a plurality of terminal devices connected to the host computer by a communication line, each terminal device side specifies a user group and transmits transfer data to the host computer. A data transfer processing unit is provided, and a data file composed of a standby binding organization file, a management file composed of an index sequential organization file, and a user group are transmitted from the terminal device to the host computer side. And a reception processing unit that stores the received transfer data in one subfile created in the data file and stores management information of the subfile and transfer data in a management record created in the management file. Data transfer method between host and terminal. 3. The reception processing unit creates a management record in the management file with a key value including an identifier of a user group designated by the terminal device, stores management information, and stores the management information and the key value. A subfile having the same content or a content obtained by deleting some digits of the key value within a range where duplication does not occur is created in the data file to store transfer data. The data transfer method between the host and the terminal according to item 2. 4. The host computer side obtains a corresponding management record from the management file, recognizes a subfile name from the key value, accesses the corresponding subfile of the data file, and extracts transfer data. 4. The data transfer system between a host and a terminal according to claim 3, further comprising: 5. A system including a host computer and a plurality of terminal devices connected to the host computer via a communication line, wherein a transmission request record designating desired reception data is transmitted to the host computer to each of the terminal devices. , A user comprising a reception data transfer processing unit for receiving data transmitted from the host computer in response thereto, and each user comprising a standby connection organization file on the host computer side and to be transmitted from the host computer to the terminal device A data file that stores transfer data for each group as one sub-file, and an index sequential file, each sub-file of the data file has a one-to-one correspondence with a management record. A management file that stores management information for files and transfer data. And a sub-file storing the desired reception data from the data file by referring to the management record in the management file related to the desired reception data in the transmission request record received from the terminal device, A data transfer system between a host and a terminal, comprising: a transmission processing unit for transmitting data stored in a sub file to the terminal device. 6. On the host computer side, data to be transmitted to a terminal device is stored in different subfiles of the data file for each user group, and transfer is stored in each subfile and each subfile. 6. The host-terminal data transfer method according to claim 5, further comprising a storage processing unit that creates a management record storing management information of data in the management file. 7. The storage processing unit creates a management record in the management file with a key value including an identifier of a user group to store management information, and stores the same content as the key value or duplication. 7. The host / terminal according to claim 6, wherein a sub file having a sub file name having a content in which a number of digits of the key value is deleted is created in the data file to store the transfer data in a range that does not occur. Inter-data transfer method. 8. The index information is generated by extracting a management record for the user group from the management file by requesting index information from the terminal device by designating a user group on the host computer side. Then, an index transfer unit for transmitting this to the terminal device is provided, and the index information sent in response to each terminal device side requesting the index information by designating the user group to the host computer. Is displayed on the screen of the display device to allow the user to select the desired reception data, and an index processing unit for notifying the reception data transfer processing unit of the information specifying the selected desired reception data. The data transfer system between a host and a terminal according to claim 7. 9. The index processing unit notifies the reception data transfer processing unit of data specifying the deletion desired data when the user selects the deletion desired data, and the reception data transfer processing unit is notified of the data. The deletion request record designating the deletion desired data is transmitted to the host computer, and the transmission processing unit deletes the management record related to the data requested to be deleted in the deletion request record from the management file and also creates a corresponding subfile. 9. The data transfer system between a host and a terminal according to claim 8, characterized in that the data transfer is deleted from the data file.