JP5106499B2 - User extraction apparatus and method - Google Patents

Description

  The present invention relates to a technique for extracting a user who satisfies a predetermined condition with respect to a user who accesses a website via a communication network.

  Conventionally, as an example of analyzing behavior history (viewing pages, search keywords, etc.) on a user's website and utilizing it for various marketing, so-called targeting advertisements that select and display an advertisement that matches the user's behavior history It is known (see, for example, Patent Document 1).

JP 2004-252494 A

  However, in the general targeting advertisement as described above, for example, even if a user who is assumed to be interested in real estate is extracted from an action history such as a browsing page or a search keyword as a target for delivering a real estate related advertisement. In many cases, the number of users having an action history that matches the extraction condition is small, and a sufficient amount of target users cannot be secured. In addition, such a method does not lead to real estate from the action history alone, such as not browsing real estate related pages or searching for real estate related keywords, but actually interested in real estate. It was difficult to approach users who were potentially interested in real estate.

  In other words, since the analysis of the user's behavior history in the past is an approach only for the user who has the behavior history, other features having similar feature information to the user having certain feature information (profile, behavior history, etc.) Couldn't find any users.

  Another issue is whether the user has requested materials, such as a material request page on a website that handles information provided by a third party operated by the portal site. The page where the user's intended behavior can be confirmed was not effectively used in business.

  It is an object of the present invention to have a user having similar feature information or a similar feature information to a user having the feature information in order to perform an approach such as distributing advertisements to users other than those having certain feature information. It is to efficiently extract the user who is estimated to be.

  In addition, another object of the present invention is to effectively use a page on which a user target action can be confirmed.

Based on the above object, one aspect of the user extraction device of the present invention is a feature information storage means for storing user feature information in association with user identification information, and a user target action confirmation transmitted from a client terminal. Page delivery means for receiving a page request for a page and delivering the user intended behavior confirmation page; achievement information indicating that the user has acted on the user intended behavior confirmation page; and identification information of the user The achievement information receiving means for receiving, the feature information corresponding to the identification information of the user is acquired from the feature information storage means, and the correct information is created by associating the feature information and the achievement information with the identification information of the user. , the correct answer information generating means for registering the correct answer information storage means, a portion of the acquired characteristic information from the characteristic information storage means, the correct answer information storage It performs matching by using the portion of the acquired correct answer information from the stage, and extracts identification information of a user associated with the feature information including a portion subjected to the matching satisfies a predetermined criterion, the correspondence to the correct answer information And target user information extracting means for registering in the target user information storage means as target user information.

An aspect of grasping the present invention as a method is a user extraction method, in which user feature information is associated with user identification information in advance and stored in the feature information storage unit, and the user purpose transmitted from the client terminal A page delivery process for receiving a page request for an action confirmation page and delivering the user purpose action confirmation page, achievement information indicating that the user has taken the action on the user purpose action confirmation page, and identification of the user The achievement information receiving process for receiving information, the feature information corresponding to the identification information of the user is obtained from the feature information storage means, and the correct information is obtained by associating the feature information and the achievement information with the identification information of the user. create a correct answer information creation process for registering the correct answer information storage means, a portion of the acquired characteristic information from the characteristic information storage means, before Correct answer information performs matching by using the portion of the acquired correct answer information from the storage unit, and extracts the identification information of the user associated with the feature information including a portion subjected to the matching satisfies a predetermined reference, the correct answer information And a target user information extraction process registered in the target user information storage means as target user information associated with the target user information.

  As described above, the user extraction device of the present invention confirms the user goal behavior called conversion, which is the final goal / result obtained by the website operator on a certain website, such as requesting materials, inquiries, and member registration. On the user's target action confirmation page, using the correct answer information of the user who caused the target action (hereinafter referred to as “correct answer user”), matching is performed with the feature information of other users (hereinafter referred to as “matching target user”) It is possible to extract identification information of a user (hereinafter referred to as “target user”) associated with feature information that satisfies a predetermined criterion, and obtain target user information associated with correct information. Since the target user is presumed to be a user having a similar preference to the correct user, various approaches such as advertisement distribution can be made to the target user. That is, by guiding the target user from the correct user, the number of users to be approached can be increased.

Further, the user extraction information of the present invention includes action history information related to web access in the feature information part, and the action history information that is the part of the feature information acquired from the feature information storage means by the matching. The matching is performed using achievement information which is a part of the correct answer information acquired from the correct answer information storage means.

  Thus, in the user extraction device of the present invention, a target user having an action history similar to the action history on the correct user's website can be extracted. In other words, since the target user does not take action corresponding to the achievement information, even if the user does not directly connect to the achievement information from the action history, the correct user and the target will have the same action history as the correct user. User preferences are similar, and it is possible to extract potential users from an estimate that they are actually interested in achievement information.

In the user extraction device of the present invention , profile information is included in the feature information portion, and the profile information that is the feature information portion acquired by the matching from the feature information storage means is stored in the correct information storage device. Matching is performed using profile information that is a part of the correct answer information acquired from the means.

  Thus, in the user extraction device of the present invention, a target user having a profile similar to the profile of the correct user can be extracted. That is, even if the user has little behavior history information, if the profile of the correct user is similar, the preferences of the correct user and the target user are similar, and in fact, they are interested in the achievement information of the correct user. Potential users can be extracted from the estimation.

  In addition, the user extraction device of the present invention distributes information related to the user purpose action confirmation page that has confirmed the achievement information included in the correct answer information to the target user extracted by the target user information extraction unit. It further has a distribution means.

  As described above, in the user extraction device of the present invention, a correct user for a target user having an action history similar to the action history on the correct user's website or a target user having a profile similar to the profile of the correct user. It is possible to distribute information related to the user purpose action confirmation page that has confirmed the achievement information that has shown interest. Since the correct user and the target user have similar behavior histories and profiles, the preferences are similar, and it is possible to guess that the target user is also interested in information that the correct user is interested in, so not only the correct user but also the target user It is possible to expand the distribution destination of information to

  In the user extraction device of the present invention, the information related to the user purpose behavior confirmation page that has confirmed the achievement information included in the correct answer information is guidance information to the user purpose behavior confirmation page.

  As described above, in the user extraction device of the present invention, it is expected that the target user also performs the user target behavior on the user target behavior confirmation page in the same manner as the correct user by distributing the user target behavior confirmation page to the target user. Therefore, the user purpose action page can be effectively used for business.

Further, the user extraction device of the present invention includes behavior history information related to web access in the feature information portion, and the action history information that is the feature information portion acquired by the matching from the feature information storage means. The matching is performed using achievement information which is a part of the correct answer information acquired from the correct answer information storage means.

  Thus, in the user extraction device of the present invention, it is possible to extract a target user having an action history on a website related to achievement information of correct users. That is, even if the user has no information about the profile, the preference is similar if the user has a similar action history related to the achievement information of the correct user, and in fact, the user has a similar profile to the correct user. Potential users can be extracted.

  In the user extraction device of the present invention, the feature information includes profile information in addition to action history information related to web access, and is included in correct information for the target user extracted by the target user information extraction unit. It further has information distribution means for distributing information related to the profile information.

  Thus, in the user extraction device of the present invention, information related to the profile of the correct user can be distributed to a target user who has an action history on the website related to the achievement information of the correct user. Because the target user has an action history related to the achievement information of the correct user, the preferences of the correct user and the target user are similar, and it can be assumed that the correct user profile and the target user profile are also similar. It is effective if information related to the profile is distributed, and the distribution destination of information can be extended not only to correct users but also to target users.

  It should be noted that other categories such as a method or program corresponding to each of the above aspects, and more specific aspects described below are also included in the present invention.

  As described above, according to the present invention, a user having feature information similar to a user having certain feature information can be efficiently extracted.

The functional block diagram which shows the structure of embodiment of this invention. The flowchart which shows the process sequence in embodiment of this invention. The figure which illustrates the various information in embodiment of this invention. The figure showing Example 1 in embodiment of this invention. The figure showing Example 2 in embodiment of this invention. The figure showing Example 3 in embodiment of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[1. Constitution〕
As shown in FIG. 1 (configuration diagram), the present embodiment relates to a user extraction device (hereinafter also referred to as “this device”) 1 in which a computer extracts a target user similar to a correct user. As a general computer configuration, at least an arithmetic control unit 5 such as a CPU, an external storage device (HDD or the like), a storage device 6 such as a main memory, and a communication network N (such as the Internet or a mobile phone network). Communication means 7 (such as a LAN adapter). Note that the user terminal T is a personal computer, a mobile phone terminal device, or the like, and accesses the present device 1 with a built-in web browser or the like.

  In the present apparatus 1, a predetermined computer program (not shown) stored (installed) in advance in the storage device 6 controls the arithmetic control unit 5 so that elements (10, 15,...) Shown in FIG. Realize. Among these elements, information storage means can be realized in the storage device 6 in any format such as temporary storage of various databases, files, array variables, and setting values. Each means other than the storage means is a processing means for realizing / executing a function / action of information processing described below.

[2. Action)
The outline of the operation procedure of the apparatus 1 configured as shown in FIG. 1 is shown in the flowchart of FIG.
[2-1. Distribution of user purpose action confirmation page)
First, the page distribution means 10 receives a page request for a user purpose action confirmation page transmitted from the user terminal T which is a client terminal via the communication network N (step S1), and the user terminal T which has transmitted the page request. On the other hand, a user purpose action confirmation page is distributed (step S2).

  Here, the user purpose behavior confirmation page is a user's purpose behavior called conversion corresponding to the final goal / result obtained by the website operator on a certain website, such as requesting materials, inquiries, and membership registration. It means a page that can be confirmed. Specifically, the operator who provides the apparatus 1 is a portal site operator who has a search service, various links, EC services, etc., which serve as an Internet entrance (entrance) site. For example, a document request page of a site providing information (for example, real estate related information) from a third party is assumed.

  In this portal site, information on leased and newly sold properties is provided by a third-party real estate company, and users who visit the real estate information site are aware of the real estate company handling the property via the real estate information site. You can request materials and make inquiries about the property. The material request can be made by using a material request button or an inquiry form prepared by the portal site operator. When the user takes some user purpose behavior on the user purpose behavior confirmation page, the portal site operator can also obtain affiliate income from a real estate company or the like.

[2-2. Acquisition of user purpose behavior)
Next, the achievement information receiving means 20 receives and acquires achievement information indicating that the user has caused the target action on the user target action confirmation page and identification information of the user who has caused the action (step S3).

  Here, achievement information refers to the user's purpose behavior, called conversion, corresponding to the final goal / result obtained by the website operator on a certain website, such as requesting materials, inquiries, and member registration. It is information indicating that an action has been taken. In other words, a user who accesses information provided by a third party for the portal site that is operated by the portal site, such as a user accessing the third party information (request for materials, inquiries, member registration, etc.) Information indicating that the target action has occurred.

[2-3. (Creation and registration of correct information)
Next, the correct information creation unit 30 acquires feature information corresponding to the identification information acquired by the achievement information reception unit 20 from the feature information storage unit 15 (step S4). Here, FIG. 3A is an example of data in the feature information storage means 15 that stores feature information related to the user. The name, address, and age corresponding to the member ID (eg, “Y123”) that is identification information. Profile information such as sex, hobbies, and the like, as well as action history information related to web access such as the accessed URL and a category (for example, “automobile”) corresponding to the URL, are recorded as feature information. The profile information is input in advance when member registration is performed for the service provided by the apparatus 1. Moreover, even for users who are not registered as members, only action history information is acquired.

  As the identification information, in addition to the member ID, for a personal computer, for example, a registered user cookie or other unregistered general user cookie (for example, “99887 ...” in FIG. 3 (1)). Etc. can also be used. For mobile communication devices such as mobile phone terminals, terminal IDs for terminal user identification, manufacturing numbers of terminal devices, and the like are listed as identification information.

  Then, it is possible to easily grasp the web access and identify the access source user with the identification information as described above by using the above various cookies or other identification information.

  Next, the correct information creating unit 30 creates correct information by associating the identification information acquired by the achievement information receiving unit 20 with the feature information acquired in Step S4 and the achievement information acquired by the achievement information receiving unit 20 (Step S4). S5), the correct answer information storage means 35 is registered (step S6). Here, FIG. 3 (2) is an example of data in the correct information storage means 35, and is recorded as correct information by associating the feature information and achievement information shown in FIG. 3 (1) with the member ID as identification information. ing. Here, it is recorded as achievement information that the member user whose identification information is Y123 has requested a document on the real estate information site.

[2-4. Extract target users)
Next, the target user information extraction means 40 performs matching on the feature information of the matching target user acquired from the feature information storage means 15 using the correct answer information of the correct user acquired from the correct information storage means 35, The identification information of the target user associated with the feature information satisfying the above criteria is extracted (step S7). Regarding the matching and user extraction conditions, a plurality of patterns are shown in the embodiments described later. Next, the target user information extraction unit 40 registers target user information in which target user identification information and correct answer information are associated with each other in the target user information storage unit 45 (step S8).

[2-5. Distribution of information to target users)
The information distribution unit 50 acquires information (for example, advertisement) derived from correct information suitable for the target user from the information storage unit 55 and distributes the information to the target user (step S9). What kind of information is distributed can be appropriately selected depending on what kind of matching is performed, and depends largely on achievement information and feature information, and will be specifically described in conjunction with examples described later.

[3. effect〕
As described above, in the user extraction device 1 of the present invention, on the user target behavior confirmation page where the user target behavior can be confirmed, the correct information of the correct user who caused the behavior is used to match the feature information of other matching target users. It is possible to extract target user identification information associated with feature information satisfying a predetermined criterion, and obtain target user information associated with correct information. In addition, since the target user has or can be estimated to have characteristic information similar to that of the correct user, it is possible to take an effective approach to distribute appropriate information derived from the correct information to the target user. That is, by finding target users from correct users, it is possible to efficiently increase the number of users who are information distribution targets.

[4. Example (specific example of matching and information distribution)]
Hereinafter, the above-described matching, user extraction, and what kind of information will be distributed will be described as an example for each combination.
[4-1. Example 1: When using action history]
There are various modes of matching and user extraction (step S7). First, the embodiment of FIG. 4 will be described. In FIG. 4, action history information associated with the matching target user acquired from the feature information storage unit 15 is acquired, and matching is performed using the action history information included in the correct answer information of the correct user acquired from the correct information storage unit 35. It is carried out.

  Here, as an example, matching with the correct user's action history is performed using the ratio of the category corresponding to the URL of the visited website. It can be seen that the correct user action history in this example is 50% for the URL related to automobiles and 30% for the URL related to finance. Here, for example, the action history of the correct user and the action history of the matching target user are matched, and the matching target user whose matching rate with the category of the correct user satisfies a predetermined standard or higher is determined based on the predetermined standard. Extract as a satisfied target user.

  In this embodiment, it is assumed that matching target users (identification information “10869”, automobile category 48%, finance category 30%...) Having a high matching rate with the correct user's action history satisfy predetermined criteria. In addition, as a predetermined standard, the upper category of the action history of the matching target user matches that of the correct user, or the ratio of the upper category of the matching target user is within 10% above and below the ratio of the correct user. Various standards such as being included can be considered. Next, the user of the identification information “10869” is registered in the target user information storage unit 45 as target user information in which identification information and correct answer information are associated with each other as a target user. Here, the ratio of the category corresponding to the URL is used for matching, but it is of course not limited to this, and it is possible to use the URL itself, the access date match rate, or the like.

  The target user registered in the target user information storage unit 45 is a user having an action history similar to that of the correct user. In other words, it can be estimated that the target user has a preference similar to that of the correct user. Like the correct user, the target user can be expected to be a user who is interested in information related to the user purpose action confirmation page. Therefore, it is considered effective if information related to the user purpose action confirmation page that has confirmed the achievement information included in the correct answer information is distributed to the target user. For example, when the achievement information included in the correct answer information is a material request at the real estate related information site, the target user can also be expected to be interested in the real estate, and therefore, the real estate related advertisement is distributed.

  The effect of the first embodiment is not only that the number of users to whom the advertisement is distributed can be increased by matching with the action history, but even if the target user browses a page related to achievement information (in this example, real estate document request) Even if a user is not directly connected to achievement information from the action history, if the action history with the correct user is similar, the user is probably interested in the achievement information from the assumption that Can be approached.

[4-2. Example 2: When using profile information]
Next, the embodiment of FIG. 5 will be described. Here, the profile information associated with the identification information of the matching target user acquired from the feature information storage unit 15 is acquired, and matching is performed using the profile information included in the correct answer information of the correct user acquired from the correct information storage unit 35. It is carried out. Note that the matching target user in this embodiment is limited to a user who has previously registered profile information.

  As an example, the profile of the correct user “Y123” is assumed to be in his 30s, male, married, with children. The correct user profile is matched with the profile of the matching target user, and a matching target user whose matching rate with the correct user profile satisfies a predetermined criterion is extracted as a target user.

  In this embodiment, it is assumed that the profile of the user with the identification number “Y456” has a high matching rate with the profile of the correct user “Y123” and satisfies a predetermined criterion. At that time, the target user information in which the identification information and the correct answer information are associated with each other is registered in the target user information storage unit 45 with the user of the identification information “Y456” as the target user. The predetermined criteria include, for example, the number of matching items in the profile, the number of items that are not perfect matches but approximate, and the number / ratio of items whose degree of similarity exceeds a predetermined threshold. It may be determined as appropriate.

  The target user registered in the target user information storage means 45 is a user having a profile similar to that of the correct user. In other words, the target user can be estimated to have an environment such as generation and circumstances similar to the correct user. It can be expected that the user is interested in information related to the user purpose action confirmation page where the user took action. As in the case of the first embodiment, it is considered effective if information related to the user purpose action confirmation page that has confirmed the achievement information included in the correct answer information is distributed to the target user.

  As an effect of the second embodiment, matching with profile information not only increases the number of users to which advertisements are distributed, but also provides a profile with a correct user even if the user has little information about action history information. If they are similar, it is possible to approach potential users based on the assumption that they are actually interested in information related to the user purpose action confirmation page that has confirmed the achievement information of the correct user.

[4-3. Example 3: Using achievement information and action history]
Next, the embodiment of FIG. 6 will be described. Here, action history information associated with the matching target user acquired from the feature information storage unit 15 is acquired, and matching is performed using achievement information included in the correct answer information of the correct user acquired from the correct information storage unit 35. ing.

  Here, as an example, the achievement information of the correct user is requested as a material request at the real estate information site, and the action history of the matching target user has a predetermined proportion of the real estate category in the category corresponding to the URL of the visited website. Users above the standard are extracted as target users.

  In this embodiment, since the correct user's achievement information is used as a material request at the real estate information site, a user who frequently visits a house-related site (identification number “52149”, house category 38) that seems to be related to the achievement information. %) Satisfy a predetermined standard. After that, the user of the identification information “52149” is registered as the target user in the target user information storage unit 45 as target user information in which the identification information and the correct answer information are associated with each other. In addition, as a predetermined | prescribed reference | standard, for example, it is good also as a category with the highest ratio among categories corresponding to URL in action history information being a category relevant to achievement information, and a ratio is more than fixed level It may be.

  It can be said that the target user registered in the target user information storage unit 45 is a user having an action history related to an interesting matter in which the correct user took action. In other words, it can be estimated that the target user is similar in taste to the correct user and is in a similar generation and situation. That is, since it can be estimated that the target user has a profile similar to that of the correct user, it is considered effective to distribute information suitable for the profile. Specifically, if the correct user profile is a man in his 30s and is married, the target user profile is presumed to be similar to it, and the distribution conditions based on the profile are distributed in advance, such as distributing life insurance advertisements. If there is a set of advertisements, it can be distributed from there.

  As an effect of the third embodiment, by matching the achievement information with the action history, even if the user has no information about the profile, if the user has the action history related to the achievement information of the correct user, It is possible to approach a potential user based on the assumption that the user has a profile similar to the correct user, and the number of users to whom advertisements are distributed can be increased.

[5. Other embodiments]
In the first and second embodiments, an example in which an advertisement of a customer who is a third party for the portal site operator who provides the device 1 is distributed when distributing information related to achievement information has been described. The advertisement of the portal site itself related to the achievement information (so-called in-house draft) may be distributed. That is, in the approach to the target user, the guide information to the user purpose behavior confirmation page is distributed. By doing in this way, a user purpose action confirmation page can be used effectively for business.

  Specifically, the portal site operator who provides this device 1 is that the correct user's intended behavior is related to real estate provided by a third-party real estate company in the real estate information site operated by the portal site itself. If it is a document request for information, the target user performs the same action as the correct user on the user purpose action confirmation page (in this case, the document request page on the same real estate information site where the correct user took action) Since it can be expected to do so, it is preferable to deliver guidance information (in-house draft) to the user purpose action confirmation page on the real estate information site operated by the portal site operator itself to the target user. In this way, by guiding the target user to the user purpose action confirmation page, the portal site operator can obtain further affiliate income from the real estate company. This is likely to generate more revenue than the advertising revenue that can be obtained by delivering real estate-related advertisements of a real estate company that is a third party to target users. Conceivable.

  Further, in the present invention, a user who performs a specific action on the user purpose action confirmation page is a correct user. For example, a user who frequently visits a site of a specific category or a user who searches for a specific keyword is referred to as a correct user. It can also be considered.

  In addition, said each embodiment is only an illustration, and this invention includes what is illustrated below and other embodiment other than that. For example, in the present invention, elements such as each means may be realized not only by an arithmetic control unit of a computer but also by an electronic circuit based on wired logic or the like, or a non-Neumann type information processing mechanism that will appear in the future. Further, each configuration diagram, data diagram, flowchart diagram, and the like are merely examples, and the presence / absence of each element, its order, specific contents, and the like can be changed as appropriate.

  For example, the device configuration in FIG. 1 is merely an example, and the actual system is realized by a plurality of server devices such as individual devices (for example, storage means such as a database) realized by separate server devices. Alternatively, the configuration can be flexibly changed, for example, as a part of the system of the present invention including the user terminal T. Also, some functions may be realized by calling an external platform or the like with an API (Application Program Interface) or network computing.

N communication network T user terminal 1 user extraction device 5 arithmetic control unit 6 storage device 7 communication unit 10 page distribution unit 15 feature information storage unit 20 achievement information reception unit 30 correct information creation unit 35 correct information storage unit 40 target user information extraction unit 45 Target user information storage means 50 Information distribution means 55 Information storage means

Claims (8)

Feature information storage means for storing user feature information in association with user identification information;
A page distribution means for receiving a page request for the user purpose behavior confirmation page transmitted from the client terminal and delivering the user purpose behavior confirmation page;
Achievement information receiving means for receiving achievement information indicating that the user has caused the target action on the user purpose action confirmation page and identification information of the user;
Feature information corresponding to the user identification information is acquired from the feature information storage means, correct information is created by associating the feature information and the achievement information with the user identification information, and registered in the correct information storage means Correct information creation means,
The portion of the acquired characteristic information from the characteristic information storage means, performs matching with a portion of the acquired correct answer information from the correct answer information storage means, the feature information including a portion subjected to the matching satisfies a predetermined criterion Target user information extracting means for extracting identification information of the associated user and registering it in target user information storage means as target user information associated with the correct answer information;
A user extraction device characterized by comprising: The includes the portion of the feature information action history information about web access, the said matching a portion in which action history information of the feature information obtained from the characteristic information storing means is acquired from the correct answer information storage means The user extraction device according to claim 1, wherein matching is performed using action history information that is a part of correct answer information . Includes profile information on a portion of the feature information, the matching is the partial and is profile information of the feature information obtained from the characteristic information storing means, the part of the correct answer information obtained from the correct answer information storage means The user extraction device according to claim 1, wherein matching is performed using certain profile information.   It further has an information distribution means for distributing information related to the user purpose action confirmation page that has confirmed the achievement information included in the correct answer information to the target user extracted by the target user information extraction means. The user extraction device according to claim 2 or 3.   5. The user extraction device according to claim 4, wherein the information related to the user purpose behavior confirmation page that has confirmed the achievement information included in the correct information is guidance information to the user purpose behavior confirmation page. The includes the portion of the feature information action history information about web access, the said matching a portion in which action history information of the feature information obtained from the characteristic information storing means is acquired from the correct answer information storage means The user extraction device according to claim 1, wherein matching is performed using achievement information that is a part of correct information .   Information that distributes information related to the profile information included in the correct information to the target user extracted by the target user information extraction means, including the profile information in addition to the action history information related to web access. The user extraction device according to claim 6, further comprising distribution means. User feature information is associated with user identification information in advance and stored in the feature information storage means,
A page distribution process for receiving a page request for a user purpose behavior confirmation page transmitted from a client terminal and delivering the user purpose behavior confirmation page;
An achievement information receiving process for receiving achievement information indicating that the user has taken the purpose action on the user purpose action confirmation page and identification information of the user;
Feature information corresponding to the user identification information is acquired from the feature information storage means, correct information is created by associating the feature information and the achievement information with the user identification information, and registered in the correct information storage means Correct information creation process,
The portion of the acquired characteristic information from the characteristic information storage means, performs matching with a portion of the acquired correct answer information from the correct answer information storage means, the feature information including a portion subjected to the matching satisfies a predetermined criterion Target user information extraction processing for extracting identification information of the associated user and registering it in target user information storage means as target user information associated with the correct information;
A user extraction method characterized in that the computer executes.

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