JP2002189624A - Device and method for acquiring data file, and recording medium recorded with program for realizing method of acquiring data file - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a data file of an acquiring object is not able to be selected conventionally by assigning a condition about a content of the data file when the data file on a computer network is down-loaded. SOLUTION: This data file acquiring device is provided with a condition setting part 1 for assigning the condition as to the content of the acquiring object, a data investigating part 7 for retrieving/searching the content of the data file under the down-loading from the computer network based on the set conditions by the condition setting part 1 so as to search whether the data file is the acquiring object or not, a data storage part 3 for storing the down- loaded data file in a data memory 6 when the file is determined as the acquiring object by the data searching part 7, and a stopping part 5 for stopping down- loading processing by a down-loading part 2 when the file is determined as not the acquiring object, and the unnecessary data file is thereby prevented from being down-loaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data file obtaining apparatus for downloading a data file on a computer network. In particular, a device for acquiring a data file storing data satisfying the condition by designating a condition of data to be downloaded, a method for acquiring the data file, and a computer-readable recording program for executing the method for acquiring the data file It concerns a possible recording medium.

[0002]

2. Description of the Related Art FIG. 4 shows the configuration of a conventional so-called automatic circulating software (also called an autopilot) for downloading a data file on a computer network. In FIG. 4, reference numeral 8 denotes a URL (Un
a condition setting device for inputting and setting conditions relating to file information such as site information such as an i.e. Resource Resource Locator) and an extension; 9, a download (DL) device for downloading a data file matching the condition specified by the condition setting device; Is a storage device for storing downloaded data files, and 11 is a storage device for storing data files downloaded by the DL device 9.
0 is a data storage device.

Next, the operation will be described. First, the user enters a URL (Uniform Resource Local).
The conditions relating to the site information such as tor) and the file name such as the extension are input to the condition setting device 8 and set. The DL device 9 downloads a data file on the computer network based on the set conditions. The downloaded data file is stored by the data storage device 11.
It is stored in the storage device 10.

[0004]

Conventional automatic patrol software uses a URL (Uniform Resource Lo).
However, conditions for file information such as site information and extension and the like can be set, but conditions for the content of the data file itself cannot be set. Therefore, there is no means for checking whether the file needs to be downloaded until the data file is opened after the download is completed, and there is a problem that an extra communication amount and a data storage area are required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to reduce the amount of data communication in the process of downloading a data file on a computer network.

[0006]

According to the present invention, there is provided a data file acquiring apparatus for downloading a data file for storing predetermined data existing on a computer network via the computer network. A download unit that downloads a data file, a condition setting unit that specifies a content of data stored in the data file, and sets a condition for obtaining the data file, a condition set by the condition setting unit, A data investigation unit that compares data downloaded by the download unit to investigate whether the data file is an acquisition target data file, a data storage unit for storing a data file downloaded by the download unit, The results investigated by the Data Research Department , If that the data file the download unit downloads is the acquisition target has been found, in which a data storage unit for storing the downloaded data file by the download section to the data storage unit.

Further, in the data file obtaining apparatus according to the present invention, the data file has a file name for identifying the data file, and the file name indicates a format of data stored in the data file. The data file has an identifier, and the data file is configured by one of a file and a configuration including a plurality of files, and the condition set by the condition setting unit is: A condition that specifies that the stored data includes a specific data sequence, a condition that specifies that the stored data does not include a specific data sequence, and a condition that specifies that the stored data does not include a specific data sequence. That specifies that the content of the data and the format of the data indicated by the identifier of the file name of the data file are consistent. A condition that specifies that the content of the data stored in the data file and the format of the data indicated by the identifier of the file name of the data file do not match, and another data file is included in the data file. A condition that specifies that the data file does not contain another data file, a condition that specifies that the data stored in the data file is encrypted, and a condition that specifies that the data stored in the data file is encrypted. At least one condition of setting that data stored in the file is not encrypted is set.

Further, the data file acquiring apparatus according to the present invention is arranged such that when the data investigating unit conducts an investigation, it is found that the data file downloaded by the downloading unit is not the data file to be acquired. And a stop unit for instructing the download unit to stop the download.

In the data file acquiring apparatus according to the present invention, the download section divides the data file into a predetermined size and downloads the data file, and the data investigation section divides the data file into a predetermined size by the download section. A comparison is made between the data file of a predetermined size downloaded by the user and the condition set by the condition setting unit.

[0010] In a data file acquisition method according to the present invention, a data file for storing predetermined data existing on a computer network is downloaded by a data file acquisition device and stored in the data storage device. Are set in the download step of downloading the data file, the condition setting step of specifying the contents of the data stored in the data file and setting the conditions for obtaining the data file, and the condition setting step. A condition and a data investigation step of comparing the data downloaded in the download step to investigate whether or not the data file is an acquisition target data file;
As a result of the investigation in the data investigation step, when it is determined that the data file downloaded in the download step is an acquisition target, a data storage step of storing the data file downloaded in the download step in the data storage method; It has.

Further, the data file acquiring method according to the present invention is characterized in that, when the data investigating step finds out that the data file being downloaded is not the data file to be acquired in the downloading step, And a stop step for instructing the download step to stop the download.

Further, in the data file acquisition method according to the present invention, the data file has a file name for identifying the data file, and the file name indicates a format of data stored in the data file. The data file has an identifier, and the data file is one of a case where the data file is constituted by one file and a case where the data file is constituted by including a plurality of files. A condition that specifies that the stored data contains a particular data series,
The condition that specifies that a specific data series is not included in the stored data matches the content of the data stored in the data file and the data format indicated by the identifier of the file name of the data file And a condition that specifies that the content of the data stored in the data file and the format of the data indicated by the identifier of the file name of the data file do not match. The condition that specifies that another data file is included in the data file, the condition that specifies that another data file is not included in the data file, and the data stored in the data file are encrypted And that the data stored in the data file is not encrypted. A condition for the constant, and sets at least one of the conditions.

[0013] In the data file obtaining method according to the present invention, the download step divides the data file into a predetermined size and downloads the data file according to the number of divisions. Comparing the data file of a predetermined size divided and downloaded by the step with the predetermined size with the condition set in the above condition setting step,
The stopping step includes the steps of setting the condition set in the condition setting step in such a manner that the stored data does not include a specific data sequence, and the content and data of the data stored in the data file. A condition that specifies that the format of the data indicated by the identifier of the file name of the file is consistent; and the contents of the data stored in the data file and the data of the data indicated by the identifier of the file name of the data file. A condition that specifies that the format is not consistent, a condition that specifies that the data file contains another data file, and a condition that specifies that the data file does not include another data file And the result of the comparison in the above data investigation step satisfies the above conditions. If not, the stopping halfway to download the data file in a predetermined size according to the number obtained by dividing by the downloading step is to instruct the the download step.

Further, in the data file obtaining method according to the present invention, the download step divides the data file into a predetermined size and performs the download according to the number of divisions. Comparing the data file of a predetermined size divided and downloaded by the step with the predetermined size with the condition set in the above condition setting step,
The download step is a condition in which the condition set in the condition setting step specifies that a specific data series is included in the stored data,
If the result of the comparison in the data investigation step does not satisfy the above condition, downloading of the data file in a predetermined size according to the number of divisions is continuously performed up to the number of divisions. .

Further, in the data file acquisition method according to the present invention, the download step divides the data file into a predetermined size and performs the download according to the number of divisions. Comparing the data file of a predetermined size which is divided and downloaded to a predetermined size by the step with the condition set by the condition setting step,
In the downloading step, the conditions set in the condition setting step include a condition that specifies that data stored in the data file is encrypted, and a condition that specifies that the data stored in the data file is encrypted. Is not specified, and the file structure of the data file to be downloaded is the same as the condition set in the condition setting step by examining all the divided data files of a predetermined size. If the result of the comparison in the data investigation step does not satisfy the above conditions, the data file is downloaded in a predetermined size according to the number of divisions up to the number of divisions. It is performed continuously, and the stopping step is performed under the condition set in the condition setting step, One of a condition specifying that the data stored in the data file is encrypted, and a condition specifying that the data stored in the data file is not encrypted. When the file structure of the data file is a structure in which the divided data files of a predetermined size are compared until it is determined that the conditions set in the condition setting step are not satisfied, the comparison is performed in the data inspection step. If the result does not satisfy the above condition, the download step is instructed to stop downloading the data file at a predetermined size in the middle according to the number divided by the download step. is there.

According to the present invention, a program for executing a data file acquisition method of downloading a data file storing predetermined data existing on a computer network by a data file acquisition device and storing the data file in the data storage device is recorded. In the computer-readable recording medium, a computer-readable recording medium in which a program for executing the data file acquisition method is recorded includes a download step of downloading the data file, and a content of data stored in the data file. , A condition setting step of setting conditions for acquiring a data file,
A data investigation step of comparing the condition set in the condition setting step with the data downloaded in the download step to investigate whether the data file is an acquisition target data file, and a result of the investigation in the data investigation step When it is determined that the data file downloaded in the download step is an acquisition target, the data storage method includes a data storage step of storing the data file downloaded in the download step.

Also, a computer readable recording medium having recorded thereon a program for executing the data file acquisition method according to the present invention is provided in the data file acquisition method as a result of the investigation in the data investigation step. If the step determines that the data file being downloaded is not the data file to be acquired, the method includes a stop step for instructing to stop the download in the download step.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing the configuration of the apparatus of the present invention. In FIG. 1, 1 is a URL
In addition to the conditions related to the file name such as file extension and extension, conditions for the file content itself (including / not including a specific data series, consistency between extension and content, included file [include another file in the file]) , Whether the data is encrypted or not) is input and set, and the download 2 downloads a data file from the computer network based on the conditions set by the condition setter 1 (DL) unit, 3 is a data storage unit for storing the downloaded data file in the storage device, 4 is a condition comparison unit that compares the data being downloaded with the condition set by the condition setting unit 1, and 5 is a condition comparison unit 4. If the download condition is not satisfied according to step 4, the DL unit 2 is notified of the stop of the download process during the download process. A stop (cancel) unit, 6 is a data storage device for storing a data file input by the data storage unit 3, and 7 is a data search for checking the contents of data being downloaded based on the condition set by the condition setting unit 1. Department.

Next, the operation of obtaining a data file will be described with reference to the flowchart of FIG. First, a condition for downloading a data file is set in the condition setting unit 1 by a user's input (S1), and downloading of the data file from the computer network is started in the DL unit 2 based on the set condition. Is done. The data in the middle of the download process is sent to the condition comparing unit 4 in a specific size, and a condition comparison between the data and the condition is executed (S2). The condition comparison performed by the condition comparison unit 4 is a process of comparing the conditions regarding the file name such as the site information and the extension described in the conventional example with the downloaded data file. If the condition for the content of the file itself is set (S3, YES), the data is sent from the condition comparing unit 4 to the data checking unit 7, and the data checking unit 7 searches and checks the data content. (S4). As a result of searching and investigating, if the conditions are satisfied (S5, Y
ES), the download unit 2 downloads all the rest of the data file (S8), and the data file is stored in the data storage device 6 together with the URL information by the data storage unit 3 (S9). As a result of the search / investigation, if the conditions are not satisfied (S5, NO), the download is stopped. A condition that specifies that a specific data series is not included in the data in which the set condition is stored;
A condition that specifies that the content of the data stored in the data file and the format of the data indicated by the identifier of the file name of the data file are consistent, and the content and data of the data stored in the data file A condition that specifies that the format of the data indicated by the identifier of the file name is not consistent, a condition that specifies that the data file includes another data file, and a condition that specifies that the data file includes another data file If any of the conditions for designating that the data file is not included is satisfied, the process branches to S6 and S7 when the determination in S5 is not satisfied, and the download is immediately stopped halfway. This is because even if all the divided data files are not checked, it is found that the data files are not already downloaded during the download. Here, in the case of NO in step S5, an example has been described in which the download is stopped when the condition input to the condition setting unit 1 is not satisfied. May be input to the condition setting unit 1, and a condition "other than a data file satisfying this condition" may be set in the condition setting unit 1. The effect of can be obtained. That is, as a condition for executing the download, “a data file not including a specific data string”
Is input by the condition setting unit 1 to the user, and a "data file including a specific data string" is input by the user as a condition for stopping download, and the opposite condition is "does not include a specific data string". Step S
It is equivalent to determine as the download condition determined in step 5. Next, if the download of all data files meeting the set conditions has been completed (S10, YES), the process is terminated. If the download of all the data files meeting the conditions set in S10 has not been completed (S10, NO), S
The download processing is repeated again from the processing of step 2. As a result of the comparison processing in S5, if the data content does not satisfy the condition set in the condition setting unit 1, cancel is immediately performed.
The unit 5 transmits a download stop command to the DL unit 2 (S
6), the download unit 2 stops the download process (S7). Then, the process returns to S10. Here, if the download of all the data files meeting the conditions set in S10 as described above has not been completed (S10, NO), the process from S2 is executed and the download process of the data file is repeated. If a condition such as “not including a specific data string” that cannot be determined by simply reading the head of the data file is set, the processing of steps S2 to S5 is performed by dividing the divided downloaded data file. It is repeatedly executed for each partial data of the file. Here, if it is determined that the condition is not satisfied in step S5, the process of stopping the divided download (S2) at that time, that is, step S5
Proceed to step 6. If the condition that specifies that "the data stored in the data file is encrypted" or the condition that specifies that "the data stored in the data file is not encrypted" Depending on the file structure of the file, there is a case where the determination can be made without investigating all the divided data files, and a case where the judgment is made by investigating all the data files. In the former case, the process branches to S6 and S7 in the determination of S5, and the download process is stopped halfway. In the latter case, step S
The processing of 2 to S5 is repeatedly executed for each partial data of the data file divided and downloaded. On the other hand, as a result of the divided download repeatedly executed in steps S2 to S5, when all the remaining data are downloaded,
Proceeding to step S9, the data file downloaded as described above is stored in the data storage device 6. Other processes are the same as those described above.

With reference to FIG. 3, an example will be described in which the condition setting unit 1 sets a condition for making a data file including a specific data sequence as an acquisition target and acquires a data file. In FIG. 3, reference numeral 100 denotes an example of a condition for acquiring a data file including a specific data sequence set by the condition setting unit 1. Reference numeral 110 denotes an example of the content of a data file downloaded by the DL unit 2 for each predetermined data size. Reference numeral 7a denotes a result notification. Other symbols are the same as those in FIG. The data checking unit 7 searches and checks the data file 110 to confirm whether a data series that matches the condition 100 exists in the data file 110.
In the example of FIG. 3, since a matching data series exists, the DL unit 2 is notified of the result 7a of “existing”. Prior to the condition checking process in the data checking unit 7, the condition comparing unit 4 compares the conditions relating to the file name such as the site information and the extension with the data file. If there is no matching data series, the cancel unit 5 notifies the DL unit 2 of the stop of the download process. In FIG. 2, when the confirmation of S3 is YES and the condition of S5 becomes YES, the processing of S3 and S4 is not performed thereafter, and the result notification 7a notifies the DL unit 2 of the remaining data file by the result notification 7a. Are requested to be downloaded by the data storage unit 3 and stored in the data storage device 6.

As described above, the condition setting unit 1 capable of inputting and setting conditions for the contents of the file itself, the data checking unit 7 for searching and checking data in the middle of the download processing based on the set conditions, and A cancel unit 5 for canceling the download process, so that the download process of the data file that does not meet the conditions can be interrupted in the middle, so that the data traffic and data in the process of downloading the data file on the computer network The disk capacity for storing files can be reduced.

In the first embodiment, a download unit for downloading data on a computer network, a data storage unit for storing the downloaded data as a data file, a data storage unit for storing a data file, and conditions for downloading are described. A condition setting unit for inputting and setting, particularly when the condition setting unit inputs and sets conditions for downloading a data file, a URL (Uniform Resource Lo) is used.
In addition to the conditions for file information such as site information such as file name and extension, etc., the conditions for the file content itself (including / not including a specific data series, consistency between extension and content, inclusion file [file Data file acquisition device having a data checking unit for inputting and setting encrypted / unencrypted files, etc.), and checking the data contents during the download process based on the set conditions. An example has been described. Furthermore, an example of the data file acquisition device including the stop unit that stops the download process has been described. The network is
Any form of communication medium capable of exchanging information may be used, such as fixed-line Internet, a local area network, a telephone line, wireless communication using radio, and the like. The process illustrated in FIG. 2 can be realized by a program executed by an information processing device such as a computer, a mobile phone, a portable information terminal, or a television with a built-in computer connected to a network. This program may be distributed using communication means such as a network, or may be distributed in the form of a recording medium or the like.

[0023]

As described above, according to the present invention, there is an effect that the amount of data communication in the process of downloading a data file on a computer network can be reduced.

Further, since an arithmetic unit capable of inputting and setting conditions for the contents of the file itself is provided, it is possible to set detailed conditions, and there is an effect that the user can download only necessary files.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a configuration diagram of a data acquisition device according to a first embodiment.

FIG. 2 is a flowchart illustrating an example of a data file acquisition procedure of the data acquisition device.

FIG. 3 is a diagram showing an example of acquiring a data file when a specific data series is specified as a condition.

FIG. 4 is a diagram showing a configuration of conventional automatic patrol software.

[Explanation of symbols]

1 condition setting section, 2 download (DL) section, 3 data storage section, 4 condition comparison section, 7a result notification, 5 stop (cancel) section, 6 data storage device, 7 data investigation section, 100 conditions, 110 data file Content.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B075 KK07 KK13 KK22 KK33 KK37 ND20 ND23 ND36 NS10 PQ05 QS20 5B082 EA09 HA05

Claims (12)

[Claims] 1. A data file acquisition device for downloading, via the computer network, a data file that stores predetermined data existing on a computer network, a download unit that downloads the data file, and a storage unit that stores the data file. A condition setting unit that specifies the contents of the data that has been downloaded and sets the conditions for acquiring the data file. The conditions set by the condition setting unit are compared with the data downloaded by the download unit. A data checking unit for checking whether the data file is a target data file; a data storage unit for storing a data file to be downloaded by the download unit; and a download by the download unit as a result of the search by the data checking unit. Data file If There was found to be the acquisition target, the data file acquisition device, characterized in that it comprises a data storage unit for storing the downloaded data file by the download section to the data storage unit. 2. The data file has a file name for identifying the data file, the file name has an identifier indicating a format of data stored in the data file, and the data file is: The condition set by the condition setting unit is either a case where the file is constituted by one file or a case where the file is constituted by including a plurality of files. , The condition that the stored data does not include a specific data series, the content of the data stored in the data file, and the file name of the data file A condition that specifies that the format of the data indicated by the identifier of the data file is consistent with the format of the data stored in the data file. A condition specifying that the data format is not consistent with the data format indicated by the identifier of the file name of the data file, a condition specifying that another data file is included in the data file, and a data file A condition that specifies that another data file is not included in the data file, a condition that specifies that the data stored in the data file is encrypted, and a condition that specifies that the data stored in the data file is encrypted 2. The data file acquisition device according to claim 1, wherein at least one of a condition specifying that the data file is not set is set. 3. The data file acquisition device, if the data investigation unit investigates that the data file being downloaded by the download unit is not a data file to be acquired, 3. The data file acquisition device according to claim 1, further comprising a stop unit for instructing the unit to stop downloading. 4. The download section divides the data file into a predetermined size and downloads the data file. The data investigation section divides the data file into a predetermined size by the download section and downloads the data file having a predetermined size. 2. The data file acquisition device according to claim 1, wherein the data file acquisition device compares the condition set by the condition setting unit with a condition set by the condition setting unit. 5. A data file acquisition method for downloading a data file stored on a computer network and storing the data in a data file by a data file acquisition device and storing the data file in a data storage device. A download step, a condition setting step of setting conditions for obtaining a data file by designating the contents of data stored in the data file, a condition set by the condition setting step, and a download by the download step A data inspection step of comparing the obtained data with the obtained data file to check whether the data file is an acquisition target, and a data file downloaded by the download step as a result of the investigation by the data investigation step If it is the acquisition target is found, the data file acquisition method characterized by comprising a data storage step of storing the downloaded data file by the download step in the data storing method. 6. The data file obtaining method according to claim 1, wherein, as a result of the investigation in the data investigation step, it is determined that the data file being downloaded in the downloading step is not a data file to be acquired. 6. The data file acquisition method according to claim 5, further comprising a stop step for giving an instruction to stop download of the step. 7. The data file has a file name for identifying the data file, the file name has an identifier indicating a format of data stored in the data file, and the data file is: The condition set in the condition setting step is either a case where the file is constituted by one file or a case where the file is constituted by including a plurality of files. , The condition that the stored data does not include a specific data series, the content of the data stored in the data file, and the file name of the data file And a condition that specifies that the format of the data indicated by the identifier held by the data file is consistent with the data stored in the data file. A condition that specifies that the contents of the data and the data format indicated by the identifier of the data file have an inconsistency, a condition that specifies that the data file includes another data file, A condition that specifies that the data file does not contain another data file, a condition that specifies that the data stored in the data file is encrypted, and a condition that specifies that the data stored in the data file is encrypted 7. The data file acquisition method according to claim 5, wherein at least one of a condition specifying that the data file is not converted is set. 8. The download step, wherein the download is performed in accordance with the number of data files divided into predetermined sizes and divided, and the data investigation step is performed by dividing the data file into predetermined sizes by the download step. Comparing the data file of the given size with the condition set in the condition setting step, wherein the stopping step is a step in which the condition set in the condition setting step is such that a specific data series is stored in the stored data. A condition that specifies that the content is not included, a condition that specifies that the content of the data stored in the data file matches the format of the data indicated by the identifier of the file name of the data file, The contents of the data stored in the file and the data file file A condition that specifies that the format of the data indicated by the identifier of the data file does not match, a condition that specifies that the data file includes another data file, and a condition that the data file includes another data file If the result of the comparison in the data investigation step does not satisfy the above condition, the data file is divided according to the number of divisions in the download step. 8. The data file acquisition method according to claim 7, wherein an instruction is given to the download step to stop downloading at the size in the middle. 9. The download step, wherein the download is performed in accordance with the number of data files divided into predetermined sizes and divided, and the data investigation step is performed by dividing the data file into predetermined sizes by the download step. The data file of the predetermined size is compared with the condition set in the condition setting step. In the downloading step, the condition set in the condition setting step is such that a specific data sequence is stored in the stored data. Is a condition that specifies that it is included,
If the result of the comparison in the data investigation step does not satisfy the above condition, downloading of the data file in a predetermined size according to the number of divisions is continuously performed up to the number of divisions. The data file acquisition method according to claim 7, wherein 10. The downloading step includes performing the downloading according to the number of the data files divided into a predetermined size and dividing the data file. The data investigation step includes downloading the data file divided into a predetermined size by the downloading step. Comparing the data file having the predetermined size with the condition set in the condition setting step, and the download step encrypts the data stored in the data file with the condition set in the condition setting step. Condition that the data stored in the data file is not encrypted, and the file structure of the data file to be downloaded is divided Check all data files of the specified size In the structure in which the conditions set in the setting step are compared, if the result of the comparison in the data checking step does not satisfy the condition, the data file is divided into a predetermined size according to the number of divisions. The downloading is continuously performed up to the divided number, and the stopping step is a step in which the condition set in the condition setting step is a condition that specifies that the data stored in the data file is encrypted. The condition that specifies that the data stored in the data file is not encrypted, and the file structure of the data file to be downloaded is such that the divided data file of the predetermined size is A structure in which comparison is performed until it is found that the condition set in the condition setting step is not satisfied. , If the result of the comparison by the data investigation step does not satisfy the above conditions,
8. The data file acquisition method according to claim 7, wherein the download step is instructed to stop downloading the data file in a predetermined size in the middle according to the number divided by the download step. . 11. A computer-readable storage medium storing a program for executing a data file acquisition method in which a data file storing predetermined data existing on a computer network is downloaded by a data file acquisition device and stored in the data storage device. A download step for downloading the data file, a condition setting step for specifying a content of data stored in the data file and setting a condition for obtaining the data file, and a condition setting step A data investigation step of comparing the conditions set by the above with the data downloaded in the download step to investigate whether the data file is an acquisition target data file; A data storing step of storing the data file downloaded by the download step when the data file downloaded by the download step is found to be an acquisition target. A computer-readable recording medium recording a program for executing the method. 12. The data file obtaining method according to claim 1, further comprising: performing a search in the data checking step, and determining that the data file being downloaded in the downloading step is not a data file to be obtained. 12. A computer-readable recording medium recording a program for executing the data file acquisition method according to claim 11, further comprising a stop step for instructing to stop downloading the step.