JP5561842B2 - Information search device, information search program, and program storage medium - Google Patents

Description

  The present invention provides a search result reflecting a user's search process to a user when a user searches for target information from a vast amount of information stored in a database using a computer. The present invention relates to an information retrieval apparatus.

  With the spread of information and communication networks, especially the Internet, users have gained access to an enormous amount of information. On the other hand, it has become difficult to obtain target information directly from a huge amount of information. Therefore, for example, on the Internet, websites called search sites are widely used. In search sites, a computer system or program called a search engine cooperates with a WWW server to provide an information search service for accessing information that a user wants to obtain from a huge amount of information.

  A search engine is a database (provided information database) that provides information (provided information) to the user as a clue to the information that the user wants to finally obtain, such as the contents and location of the vast amount of information on the Internet ) Is stored and managed. When a category specification for limiting the information search range or an arbitrary keyword is accepted as a query from a browser of a client computer (user terminal) operated by a user such as a personal computer, the query is provided as an information database. And return a Web page (search result list page) listing the corresponding provided information. From the information presented in the list, the user finds the provided information that describes the content of the information that he / she wants to obtain, and specifies the link set in the provided information on the user terminal. Get the information you want.

  Currently, search engines improve the performance of the hardware itself, and by improving the search algorithm, the appearance frequency of keywords specified by the user as a search query and how close the keywords are in the body of the Web page Or the like, and the presentation order of the provided information in the search result list is determined. In some cases, the order is determined according to the frequency (access ranking) in which a user actually requests a link from the search result list and obtains information. In addition, there is an information search technique for determining provided information to be extracted and its presentation order by weighting according to the input order of keywords in an AND search using a plurality of keywords (for example, see Patent Document 1). Patent Document 2 discloses a technique for determining the order of information to be presented to a user in accordance with a keyword and a time zone or time when the keyword is input.

Japanese Patent Laid-Open No. 11-175537 JP 2003-173352 A

  The idea of the conventional information search technology, including the information search technology described in the above-mentioned patent literature, is based on the keywords specified by the user. The purpose is to preferentially present the information actually requested. However, users are not always searching for information with a clear purpose. Rather, it is often the case that information retrieval is performed vaguely and the direction of information retrieval is found for the first time after seeing the retrieval result. In addition, when a user purchases a product that meets his / her condition at an electronic store having a product search function, the correlation between the time of the search and the keyword used for the product search is not important.

  Certainly, there are products that are closely related to time, such as admission / advancement season, athletic meet season and video camera. However, there is almost no possibility that a specific video camera model and a specific time have a strong correlation. That is, the user searches for a product in order to select the model of the video camera, and the technique of Patent Document 2 cannot preferentially present information that meets the user's purpose.

  For example, in an online shopping mall that includes a large number of electronic stores, search for products handled by each electronic store based on a keyword received from a user terminal, and a search result page listing the outline of the sales page of the corresponding product. An information search service that returns information to user terminals is provided. In addition, a link to the corresponding sales page is set in each summary column, and if the link is designated on the user terminal, detailed information on the corresponding product and a function for guiding to the subsequent purchase procedure A Web page (product sales page) including the URL is returned.

  In the case of purchasing products in such an online shopping mall, if a user wants to purchase a product (such as a digital camera) in an electronic shopping mall, if the model specifications and market prices are examined in advance, the price will be low. Products can be purchased at stores that meet certain conditions such as fast delivery, cash on delivery. Therefore, the keyword given to the search engine should first specify the model, and then specify the conditions regarding the price range, delivery date, and payment method to the search engine associated with the online shopping mall.

  However, for users who want to buy a digital camera for the time being, but have not clearly decided which model to buy, the number of pixels, memory media to be used, zoom magnification, camera shake correction function, etc. The search criteria should be keywords related to the functions and performance that are particularly needed. The search result list presented by the search engine based on such conditions presents relevant information in the order of model, manufacturer, price, and popular model with many purchasers. However, the presentation order of the most important information for the user is not the order of presentation. It is important for the user to recognize what kind of search process and search conditions the information related to a specific product in a specific electronic store is presented at the top. If there is a correlation between the keyword and the information ranked in the top of the search results, the user who specified the keyword will be able to find out exactly what the information on the top of the search result list is about the product he / she wants. You can be sure that it is information.

  The present invention has been created based on the above consideration. An object of the present invention is to provide an information search apparatus capable of presenting a search result list in an order that reliably reflects the information search purpose of the user.

A first invention for achieving the above object is an information search apparatus for outputting provided information based on an inputted query,
A means for communicating with the user terminal, a storage means, and a control means;
The storage means may store correspondence between the evaluation value and the query and the provided information, the evaluation value is to describe the superiority relationships between query corresponding to each of the provided information,
The control means enables provision information presentation order processing and provision information output processing,
When the query A is input from the user terminal, the provision information presentation order process specifies the provision information corresponding to the query A, and the evaluation value of the query A corresponding to each of the identified provision information To determine the order of presentation of the identified offer information,
The provision information output process outputs the specified provision information to the user terminal according to the presentation order;
This is an information retrieval apparatus characterized by the above.

The second invention is the first invention, the storage means stores a correspondence relationship between the query and the value with the provided information,
The control means is an information search device that executes a query evaluation process for generating the evaluation value based on a value of a corresponding query for each of the stored provision information.

According to a third invention, in the first or second invention,
The control means enables index creation processing for creating and storing index information in which a certain query x is used as an index and a set of provided information and the evaluation value is associated with the query x, and
In the provided information presentation order processing, information that identifies the set of the provided information and the evaluation value of the query A by referring to the index information for the query A, and determines the presentation order based on the identified set A search device.

A fourth invention is an information search method for outputting provided information based on an inputted query by a computer having means for communicating with a user terminal and storage means,
It said storage means stores a correspondence relationship between the evaluation value and the query and the provided information, the evaluation value is a description of the superiority or inferiority relationships between query corresponding to each of the provided information,
The computer executes provided information presentation order processing and provided information output processing,
When the query A is input from the user terminal, the provision information presentation order process specifies the provision information corresponding to the query A, and the evaluation value of the query A corresponding to each of the identified provision information To determine the order of presentation of the identified offer information,
The provision information output process outputs the specified provision information to the user terminal according to the presentation order;
This is an information search method characterized by this.

  According to the information search device of the present invention, in an information search mode in which a query received from a user terminal operated by a user is referred to a database, a corresponding record is extracted and displayed in a list on the user terminal, the user's It is possible to match the priority of information retrieval purposes with the order of records presented in the list.

It is a network block diagram containing the information search device in the Example of this invention. It is the screen schematic diagram of the goods sales page which constitutes the electronic store which the above-mentioned information search device opens on the Internet. It is the screen schematic diagram of the homepage of the said electronic store. It is the screen schematic of the goods top page in the said electronic store. It is the screen schematic diagram of the search result list page which the above-mentioned information search device generates in the process of information search. It is the schematic of the keyword ranking database incidental to the said information search device. It is the schematic of the provision information presentation order | rank determination process which the said information search device performs. It is the schematic of the keyword ranking database which the said information search device produces based on a user terminal and communication. It is the schematic of the update process of the keyword ranking database which the said information search device performs. It is the screen schematic of the other example of the said product sales page. It is a flowchart of the information processing regarding sending of a search result list page and creation / update processing of a keyword / ranking / database in the information retrieval apparatus. It is the schematic of the index database which can be attached to the said information search device. It is a screen schematic diagram of a search result list page including a requested keyword designation support function.

=== Information Retrieval Device ===
FIG. 1 shows a network configuration including an information retrieval apparatus according to an embodiment of the present invention. In this embodiment, a user terminal 10 equipped with a browser and the information search apparatus 1 are connected to the Internet 100. An information search apparatus (hereinafter referred to as a search apparatus) 1 according to the present embodiment is a computer system including a WWW server function, and is an attached database (2, 3) based on information acquired in a communication process with a user terminal 10. , The corresponding record (provided information) is extracted, and a search result list page listing the provided information is returned to the user terminal 10.

  In this embodiment, it is assumed that the search device 1 publishes an electronic store that handles products of various genres from home appliances and computer-related products to health foods on the Internet 100 by the WWW server function. The functions and operations of the search device 1 will be described by giving an example of purchasing a digital camera at an electronic store by operating its own user terminal 10. Further, it is assumed that the user does not specify the model of the camera but intends to purchase a digital camera that satisfies requirements such as a specific function, performance, and price range desired by the user.

=== Provided information database ===
The electronic store opened by the search device 1 includes a Web page (product sales page) including information on each product sold by the store and a function for accepting product purchases. FIG. 2 shows an outline of the product sales page screen. The merchandise sales page 20 includes an explanation 21 about the merchandise and an image 22 of the merchandise, as well as a quantity input field 23 for the merchandise to be purchased and a “Add to shopping cart” button 24 for giving a purchase instruction.

  The provided information database 2 associates a classification category (computer, leisure, etc.) for the corresponding product with each of a large number of product sales pages constituting the website of the online store as a query from the user terminal 10. A number of acceptable keywords are associated.

=== Information Search Procedure ===
Next, a procedure until the user obtains information about the target product using the search device 1 will be described. FIGS. 3 to 5 show screen transitions until a specific product sales page is displayed on the user terminal 10 starting from the homepage of the online store. First, the user selects the category 31b of the digital camera on the user terminal 10 from the product category 31 described on the homepage of the online store (FIG. 3: reference numeral 30). The search device 1 returns an initial screen (product top page) for the corresponding product category to the user terminal 10 (FIG. 4: reference numeral 40). The merchandise top page 40 includes an option 41 for accepting designation of a maker name and a function (such as the number of pixels) of a merchandise so that a user can directly designate a keyword related to the merchandise. This option 41 is presented by an individual frame (option frame) 42. In addition, on the product top page in this example, information that is not related to information search by the user such as the advertisement content 43 is posted in a frame 44 different from the option frame 42.

  In this embodiment, the option 41 is not a directory, but is a word extracted in the provided information that is a product sales page as a keyword that can be accepted as a query. For example, keywords included in each provided information are aggregated according to manufacturer, price, color, function, etc., and when searching for products by price or the number of pixels, price range (10,000 to 30,800 yen) Etc.) and the number of pixels (5 million to 10 million pixels, etc.), the price itself (19,800 yen, etc.) and the number of pixels itself (6.3 million pixels, etc.) are prepared as options. That is, the options themselves are keywords (request keywords) reflecting the user's request.

  The user designates an appropriate option 41 prepared on the product top page 40 for the function required for the product. The search device 1 queries the database (2, 3) using the specified option as a request keyword, creates a search result list page (FIG. 5: reference numeral 50) listing the corresponding provided information, and creates the user terminal 10 Return to In the search result list page 50, an option frame 52 including an option 51 for enabling re-designation of a requested keyword on the user terminal 10 and each provided information extracted as a search result are described in individual columns 55. Thus, a frame (list frame) 53 for displaying a list is displayed in a separate frame. In the description column 55 of each provided information, a link for obtaining a product sales page including the provided information is set.

  Then, when receiving the request keyword again from the user terminal 10, the search device 1 performs a database search each time, updates the list frame 53, and returns it to the user terminal 10. In the present embodiment, when the list frame 53 is updated, the option frame 52 is updated so that the option 51 once selected is not displayed so that the option 51 once selected is not specified again. When the option frame 52 is updated, the options 51 may be presented by aggregating keywords associated with the provision information presented in the list frame 53. In this way, the keyword corresponding to the re-selectable option 51 is associated with any of the provided information being presented, and there is a selectable option 51 in the search process. However, if the option 51 is selected, the search result is never zero.

  In addition, the search device 1 posts the requested keywords received as the search history in a predetermined column 54 in the order of reception. The example shown in FIG. 5 shows a search result list page 50 that is displayed when a refinement search is performed in the order of “camera shake correction” and “5 million pixels”. In order to acquire the search history, session management by a well-known cookie may be used, and when the user selects the option 51, the option 51 is added to the search history and transmitted to the search device 1. May be. For example, when “camera shake correction” is first selected and the search result list page 50 is returned, and “5 million pixels” is further selected, information search based on AND search conditions of “camera shake correction” and “5 million pixels” is selected. May be performed. Specifically, a well-known method may be used such as describing a search condition as a parameter after a URL designating a link destination.

  If the user has provided information related to a product that is noticeable in the list frame 53, the user terminal 10 indicates the link set in the provided information posting column 55 and the product sales page ( FIG. 2: Obtain and browse the reference numeral 20). If you like a product listed on the product sales page 20, the user clicks the “Purchase this product” button 24 on this page and shifts to the product purchase procedure. Thus, the screen transition displayed on the user terminal 10 is almost the same as the screen transition displayed in the product purchase process in a general electronic store. However, the search device 1 according to the present embodiment has a special database structure different from the database in the conventional search device and performs special information processing based on the structure, so that the search device 1 is posted on the search result list page 50. The ranking of the provided information can be matched with the priority of the user's information retrieval purpose.

=== Keyword Ranking Database ===
The search device 1 is accompanied by a keyword ranking database 3. FIG. 6 shows a schematic structure of the keyword ranking database. A keyword 62 with ranking information 63 is associated with a URL 61 of a sales page for specifying provided information. The rank information may be any information as long as the vertical relationship for identifying the rank can be identified. As shown in FIG. 6, the information may be information in which the order is directly specified or may be a numerical value. The decisive difference between the search device 1 of the present embodiment and the conventional search device is that when the requested keyword is accepted as a query, the presentation order of the corresponding provided information is determined based on the keyword / ranking / database search. is there.

=== Presentation order determination process of provided information ===
Taking the keyword ranking database shown in FIG. 6 as an example, the presentation order determination processing of provided information by the search device 1 will be described. It is assumed that the search device 1 accepts a request word for “camera shake correction” based on designation of an option by the user terminal 10, for example. Then, both of the provision information 64a and 64b include a keyword “camera shake correction”. However, in the search result list page 50, the provided information 64a having the higher rank attached to the keyword “camera shake correction” is placed higher than the provided information 64b. Therefore, regardless of the conventional order of presentation such as manufacturer and price, and even if there is other provision information that includes many character strings of “camera shake correction”, “camera shake correction” is performed in the keyword ranking database 3. The provided information with the higher rank according to the rank information attached to the keyword is preferentially posted on the search result list page 50.

  Further, the input order of request keywords may be reflected in the presentation order. FIG. 7 shows an outline of the presentation order determination process that reflects the input order. There are two provision information 70a and 70b, and each provision information (70a and 70b) is associated with a keyword 72 accompanied by rank information 71, respectively. The keyword 72 is associated with a weight value (initial weight value: 73) corresponding to the rank information 71. When a request keyword is received from the user terminal 10, a weight value (secondary weight value: 75) corresponding to the input order 74 is associated with the keyword 72. Here, the secondary weight values are set to 10, 6, 4, 2, 1 for the first to fifth request keywords, and “single-lens reflex type”, “camera shake correction”, and “10 million pixels” are received from the user terminal 10. Assume that keywords are accepted in order. Note that the initial weight value and the secondary weight value are values that can be arbitrarily determined by the creator of the provision information.

  The search device 1 calculates an evaluation value 76 for each keyword by multiplying each received keyword by the initial weight value 73 and the secondary weight value 75 corresponding to the input order 74, and further calculates the evaluation value 76 of each keyword. The total (total evaluation value: 77) is calculated. In this example, the provision information 70b is presented higher than the provision information 70a. Of course, among the provided information posted on the search result list page, a plurality of provided information may have the same total evaluation value. In such a case, the order may be determined based on appropriate rules such as the order of manufacturer name, the order of product prices, and the order of the number of times the corresponding product sales page is viewed.

  Even if all of the input request keywords are not included, the provided information may be presented in order according to the comprehensive evaluation value. In FIG. 7, when three request keywords of “single-lens reflex type”, “camera shake correction”, and “SD memory card” are input in this order, comprehensive evaluation of the provided information 70a in which all the request keywords are associated as keywords. The value is “64”, and the provided information 70b has a comprehensive evaluation value of “156” and the provided information 70b is higher than the provided information 70a even though the keyword “SD memory card” is not associated. You may make it show to. In this case, each time a request keyword is received, instead of a refined search, the provision information associated with the request keyword is extracted, the comprehensive evaluation value is recalculated, and the presentation order is determined according to the calculation result. To do.

=== Create Keyword Ranking Database ===
The keyword ranking database 3 is characterized in that rank information is attached to the keywords of each provided information. This rank information corresponds to an index for estimating how close the provision information presented to the user is to the user's request. The following methods (a) to (c) can be considered as a method for creating the keyword ranking database 3.

(A) A method in which keywords provided with ranking information are associated with each provided information in advance. (B) A method created based on the contents of provided information. (C) A method created based on user requests and evaluations. Can be considered. The method (a) is a method arbitrarily determined by the creator of the provided information and does not require special information processing. In (b), when new provision information is added to the provision information database or when the existing provision information is changed, the keyword ranking database 3 is also updated. The method (c) is based on the user's request, that is, the request keyword from the user terminal 10 and the user's evaluation, that is, the actually browsed provided information or the browsed provided information from the user. This is a method for creating the keyword ranking database 3 based on the relevance to an instruction (such as purchase of a product).

  In the present embodiment, the ranking information attached to a certain keyword associated with certain provided information is information for the creator of the provided information to suggest to the user what is important in the provided information. Or information reflecting the content of the provided information itself, or information indicating the degree of association between requests from an unspecified number of users and provided information actually used by the users.

=== Keyword ranking database based on the contents of provided information ===
Words included in the provided information are extracted, and keywords corresponding to each word are totaled. Then, the keywords are ranked in order from the largest number of keywords. Alternatively, the rank may be determined according to a specific description position such as a word position, for example, a title or a text on a sales page. The ranking can also be determined according to the character size. For example, a weight value is associated with the character description position and character size, and for each keyword extracted from the provided information, a weight value corresponding to the corresponding word description position and character size is added. To go. Finally, the ranking of the keywords is determined in descending order of the total weight value.

=== Keyword ranking database based on user requirements and evaluation ===
In the keyword ranking database creation method in (a) and (b) above, the keyword ranking database 3 is not updated unless new provision information is added or existing provision information is changed, and is static. . However, the user's interest in specific provided information does not necessarily match the items that the creator of the provided information wants to present or items included in the provided information. For example, even if the creator of the provided information attaches a high ranking to the keyword “optical zoom 10 times” with emphasis on the function of the digital camera, or the provided information includes many words corresponding to this keyword. Actually, there is a lot of interest in the color of the aircraft that other digital cameras do not have, and there may be many opportunities to browse the sales page of this product. Therefore, the keyword ranking database 3 is created based on communication with the user terminal 10 so that the purpose of the user information search and the presentation order of the provided information on the search result list page are more reliably matched. May be. That is, when a user gives a certain instruction such as browsing a certain sales page (provided information) or purchasing a product from a certain requested keyword, the requested keyword is finally specified. It becomes a keyword (evaluation keyword) for evaluating one provided information.

  FIG. 8 illustrates an outline of a keyword ranking database created based on user requests and evaluations. In the keyword ranking database 3b, the total number of accesses to the product sales page 61 corresponding to certain provided information is displayed in the product sales page 61 after the user terminal 10 starts a session with the search device 1. The number of times each request keyword received given to the search device 1 before access is recorded as an evaluation value. Then, the keyword rank 63 is determined according to the ratio of the number of receptions 64 of each request keyword 62 in the total number of accesses to the specific product sales page 61. Accordingly, the contents of the keyword ranking database 3b are updated each time the acceptance ratio of each requested keyword 62 with respect to the total number of accesses to a certain sales page 61 changes. That is, the method (c) is a method for creating a keyword ranking database and also a method for dynamically updating the keyword ranking database.

  In addition, the input order of request keywords received from the user terminal 10 until the specific product sales page is accessed while performing a refined search is recorded, and the ranking of the keywords associated with each provided information is displayed during the refined search. It may be determined on the basis of the number of times the request keyword is received in each order of input. FIG. 9 shows an outline of a process for updating the keyword ranking database in accordance with the number of receptions by input order. Here, a keyword 81 and ranking information 85 for a certain provided information 80 are shown. A weighting value 82 is set for each request keyword reception order, and the number of receptions 83 in each reception order is totaled. Then, the evaluation value 84 of each keyword is calculated by weighting according to the total number of times each request keyword is received and weighting according to the number of times each request keyword is received. In this example, the weight values when the request keywords are received in the first to fifth ranks are 10, 6, 4, 2, 1, respectively, and the keyword “10 million pixels” is the request keyword. The numbers of times received in the first to fifth ranks are 10, 7, 5, 5, and 3, respectively. In this case, the keyword “10 million pixels” is summed by multiplying the weighting value in each input order by the number of receptions. That is, 10 × 10 times + 6 × 7 times + 4 × 5 times + 2 × 5 times + 1 × 3 times = 175, and 175 is an evaluation value of the keyword “10 million pixels”. In this way, evaluation values are also calculated for other keywords, and higher rank information is attached from keywords with a large evaluation value. In this example, the keyword ranking is determined in the order of “camera shake correction”, “10 million pixels”, “SD memory card”, “single-lens reflex type”, and “lightweight / compact”. You may obtain | require the evaluation value of each keyword by multiplying the weighting value according to the reception total number of times, and the frequency | count for every reception order. It should be noted that the keyword ranking information associated with the newly added provision information is statically set as described above at the beginning of addition, and dynamically based on subsequent communication with the user terminal 10. You may make it update to.

  Further, the time for adding the number of times the request keyword is received may be an appropriate time starting from when the user terminal 10 receives a link instruction from the search result list page to the sales page corresponding to the specific provided information. For example, 1 may be added to the number of receptions when the user terminal 10 accesses the corresponding product sales page or when a purchase instruction for a product actually posted in the provided information is received. Alternatively, as shown in FIG. 10, in order to ask whether or not the provided information has become a reference for the user, “Yes” or “Yes” for inputting the question 25 or an answer to the question 25 on the corresponding product sales page 20b. Include a "No" button (26, 27), add 1 to the number of receptions when the "Yes" button 26 is instructed, and add "-1" to the number of receptions when "No" is instructed You may make it do. Alternatively, 1 may be added to the number of receptions when any of the buttons (26, 27) of “Yes” and “No” is instructed. When a link instruction to the product sales page corresponding to the specific provided information is received from the search result list page 50, 1 is added to the evaluation value, and the “Add to shopping cart” button is selected from the sales page. Appropriate evaluation values may be added in a timely manner, such as adding 100 to the evaluation value at the time of instructing the purchase.

  The keyword ranking database 3 may be updated in a timely manner, such as updating simultaneously with the process of adding the number of keyword receptions as an evaluation keyword, or periodically checking the number of receptions and updating at the time of the inspection.

=== Information Search Procedure ===
FIG. 11 shows the flow of information processing related to sending the search result list page and creating / updating the keyword / ranking / database by the search device 1 described above. In this example, the user terminal 10 obtains a product top page by designating a product category on the homepage of the online store (s1, s2). When a requested keyword is input, the requested keyword is queried in the keyword ranking database 3 to specify the provision information associated with the relevant keyword, and the ranking is determined by the above-described information processing of the identified provision information. decide. Then, the specified provision information is extracted from the provision information database 2, a search result list page is created in accordance with the determined presentation order, and this is returned (s5 to s9). If necessary, the requested keyword is further specified and a search for the provided information is narrowed down (s10 → s12 → s4), and the search result list page is returned again (s5 to s9). When specific provision information in the search result list page is instructed, the corresponding product sales page is sent (s10 → s11, s14).

  In this example, the search device 1 acquires the requested keyword as an evaluation keyword when the merchandise sales page is sent to the user terminal 10, adds 1 to the evaluation value of the evaluation keyword, and further adds the keyword ranking / The database is updated (s13).

  In addition, the database search procedure is not limited to the above-described embodiment. First, the provided information database is searched based on the requested keyword, and the provided ranking of the provided information is determined by referring the extracted provided information to the keyword ranking database. May be.

=== Determining the order of presentation of provided information ===
When receiving a keyword, a database (index database) in which a combination of provision information and rank information is associated with each keyword may be created so that the presentation order of the provision information can be quickly determined. FIG. 12 illustrates the schematic structure of the index database. The index database 90 is updated as needed in conjunction with the update of the keyword ranking database 3, and the keyword ranking information 93 in each provision information 92 is associated with a specific keyword 91. In this example, a weight value for each rank is associated. Of course, this weighting value itself may be rank information. In this example, a keyword evaluation value 94 is also associated. In this example, the provision information 92 describes the URL of a product sales page that serves as identification information for the provision information. Some information and some information including the keyword 91 may be included. In this way, when the keyword is referred to the index database, the contents of the provided information described on the search result list page can be directly acquired.

  When the search device 1 receives a request keyword 91, the search device 1 compares the rank information 93 of the keyword 91 with respect to the plurality of pieces of provision information 92 associated with the corresponding keyword 91, and the search results in order from the provision information having the highest rank. Presented on the list page 50.

  When a plurality of request keywords are input by AND search, as shown in the example of FIG. 12, a weight value is associated with the rank information, and the weight value for each rank information of the received request keyword is set. What is necessary is just to determine the presentation order in the search result list page 50 according to the magnitude of the total value (total rank information). For example, when request keywords are received in the order of “lightweight / compact” and “camera shake correction”, if the ranking information of “lightweight / compact” and “camera shake correction” in a given information is first and third, The ranking weight values are added to obtain the total ranking information of 10 + 4 = 14. If the other provision information is first and second, the total ranking information is 10 + 6 = 16. In this case, the latter provision information is presented higher than the former. Of course, multiplication may be performed without adding, so that the total ranking information of the former may be 10 × 4 = 40, and the latter may be 10 × 6 = 60.

  In some cases, the ranking information in the plurality of provision information and the general order information at the AND search are the same. In such a case, the order may be determined based on appropriate rules such as the manufacturer name and price of the product. For each weighting value provision information, an evaluation value corresponding to each keyword may be added to obtain a comprehensive evaluation value, and a presentation order may be determined according to the comprehensive evaluation value.

=== Request keyword specification support function ===
The search device 1 describes an evaluation keyword in the posting column 55 of each provided information in the search result list page 50, and a request keyword designation support function that allows the user terminal 10 to select the described evaluation keyword as a request keyword. May be provided. FIG. 13 shows an outline of a search result list page created by this function. In this search result list page 50b, keywords 56 associated with each provided information 55 by the keyword ranking database 3 are appended up to a predetermined rank, and each keyword 56 has the keyword as a requested keyword. 1, that is, a URL for sending a keyword to the database search program of the search device 1 is set as a link.

  According to this request keyword designation support function, if a keyword unknown to the searcher is presented as an evaluation keyword, the searcher can search information again using the unknown keyword. That is, not only the known request keyword but also an evaluation keyword that reflects the evaluation result for the information provided by other users can be specified as a condition for information search, and the information search purpose vague for the user is clear. Thus, the user is more likely to obtain the most necessary information.

=== About change of request keyword with time ===
For example, there is a case where a digital camera at the time of its release has a special function, and a user searches for information by using a request keyword related to the function, browses information provided about the camera, or purchases the camera. Suppose there were many. However, suppose that later, other products with the same function were put on the market or the digital camera became obsolete, and the camera was sold at a low price.

  In such a case, at the beginning of the sale, the person who browses the product sales page of the digital camera must have often selected a term relating to a special function as a request keyword. And after low-price sales, the price should often be a required keyword rather than a term related to this function. Thus, the user's request for the same provision information changes with time. That is, the tendency of the reception frequency of each request keyword in the number of accesses to the provided information changes with time. Therefore, it is desirable to link the keyword rank information associated with each provision information in the keyword ranking database and the temporal change of the user's request.

  In order to link the ranking information attached to keywords to changes over time of user requests, when dynamically updating the keyword ranking database, a setting file describing the number of subtractions and the subtraction period is stored in external storage. The same provision information that originates from the reception of the same keyword by the time when the subtraction period expires, starting from the point in time when the provision information is sent to the user terminal 10 from the keyword received from the user terminal 10 Is not sent to the unspecified user terminal 10, it is conceivable to reduce the number of times this keyword is accepted in the provided information by the number of subtractions. As a result, for example, it is assumed that there is a search case in which certain provided information is sent to the user terminal 10 based on a certain keyword. If there is no same search case in the subtraction period of 1 hour from this case, the number of times the same keyword is received in the same provided information in the keyword ranking database is reduced by a predetermined number of subtractions (for example, once).

  Alternatively, the subtraction period, the number of subtractions, and the reception frequency are associated with each other (a table or the like). When the subtraction period is 1 day and the reception frequency is 5, it is assumed that the subtraction number 2 is associated. Here, it is assumed that the number of occurrences of the same search case is five when one day has passed since the occurrence of a search case. The number of occurrences is set as the reception frequency, and the number of receptions of the same keyword in the same provision information as the generation case is reduced by the subtraction number 2 corresponding to the reception frequency 5.

  In this way, for example, with regard to the information provided for a product, the number of times a specific request keyword is accepted will increase dramatically at the beginning of the sale of the product, and the absolute number of times the relevant keyword will be accepted in the keyword ranking database will vary. In a situation where there are a lot of keywords compared to the keyword of, if the number of temporarily accepted keywords is gradually reduced, the number of other keywords that are continuously accepted may eventually be exceeded. There is sex. Thereby, the presentation order of the provided information on the search result list page can be reflected in the reception status of the latest request keyword.

=== About database structure ===
In the search device 1 of the above-described embodiment, request keywords that can be selected by the user terminal 10 and keywords in the keyword ranking database are associated with each other on a one-to-one basis. Of course, as in the case of the conventional database search, the database search may be performed using a free keyword input by characters or category selection information as a request keyword.

  For example, free keywords "purple" and "purple", selectable categories "10x optical zoom" and free keyword "12x zoom", etc. In order to be able to identify one keyword in the same keyword / ranking / database even if free keywords included in the category category are given as the requested keyword, the keyword / ranking / database 3 stores the correspondence between synonyms of the requested keyword, A dictionary in which words that can be required keywords are associated with a specific category may be attached. That is, the keyword corresponding to the request keyword may be specified. In an AND search using a plurality of free keywords, each keyword is usually listed in a text box for entering a keyword by inserting a space or the like. Then, it is assumed that the search apparatus 1 has entered “camera shake correction” and “12 × zoom” in this order, and has received an AND search instruction. In such a case, the search device 1 acquires the requested keywords in the order of acceptance of “camera shake correction” and “12 × zoom”.

  It should be noted that the database structure in the search device 1 is as long as the information (such as the URL of a product sales page) for identifying each provided information is associated with the content of the provided information and a keyword with ranking information. Often. For example, the provided information database 2 and the keyword ranking database 3 may be integrated into a single database.

=== Regarding new registration of database information ===
In the above embodiment, when specific provision information is selected from the search result list page 50, information (such as URL) for identifying provision information from the user terminal 10 and a request keyword received up to the selection point are used as evaluation keywords. Acquired and 1 was added to the evaluation value of the evaluation keyword. If the evaluation keyword is not registered in the specific provision information of the keyword ranking database, the evaluation keyword is newly registered in the keyword ranking database in association with the specific provision information, and 1 is added to the evaluation value. That's fine. In the search procedure for first querying the provided information database for the requested keyword, there may be unregistered provided information in the keyword ranking database until the evaluation keyword is acquired. In this case, at the time of obtaining an appropriate evaluation keyword after the point when the provision information is selected from the search result list page 50, the selected provision information is newly registered in the keyword ranking database, and the recorded evaluation keyword The evaluation value may be 1.

  In the above search procedure, the request keyword is referred to the keyword ranking database and the corresponding offer information is extracted. At this time, the offer information in which the request keyword is not registered as the evaluation keyword is not extracted. Become. However, in the provided information database, there may be provided information corresponding to the requested keyword. Therefore, as an initial state of the keyword ranking database, all the keywords included in the provided information are set as evaluation keywords, the evaluation values of all evaluation keywords are set to 0, that is, the ranking information of all evaluation keywords is set to the same level. Is also possible. If the evaluation keyword is acquired even once thereafter, the ranking information is updated.

=== Applicability of the present invention ===
The present invention is characterized by processing for changing the presentation order of provided information based on a keyword ranking database. Therefore, the present invention is not limited to the above-described embodiment, and can be applied to any information search application as long as the information corresponding to the requested keyword received by the user input is listed and presented to the user.

  Also in the information search device at the search site, the URL of the information source is directly used as a link for obtaining information (information source: Web page, etc.) that is the origin of the provided information in the description column of each provided information on the search result list page. Instead of describing, a URL indicating that the URL of the information source is passed as a parameter to a predetermined program of the information search apparatus may be described. The information search apparatus acquires the above parameters as identification information of the provided information selected by the user terminal on the search result list page, and returns an HTTP response that redirects the user terminal 10 to the URL described as the parameter. That's fine. When the information retrieval apparatus receives the identification information of the provided information, the information retrieval apparatus may use the request keyword as the evaluation keyword of the provided information and update the evaluation value of the keyword.

1 Information Retrieval Device 2 Provided Information Database 3 Keyword Ranking Database 10 User Terminal

Claims (4)

An information search device that outputs provided information based on an input query,
A means for communicating with the user terminal, a storage means, and a control means;
The storage means may store correspondence between the evaluation value and the query and the provided information, the evaluation value is to describe the superiority relationships between query corresponding to each of the provided information,
The control means enables provision information presentation order processing and provision information output processing,
When the query A is input from the user terminal, the provision information presentation order process specifies the provision information corresponding to the query A, and the evaluation value of the query A corresponding to each of the identified provision information To determine the order of presentation of the identified offer information,
The provision information output process outputs the specified provision information to the user terminal according to the presentation order;
An information retrieval apparatus characterized by that. In claim 1,
The storage means may store correspondence between the query and the value with the provided information,
The control means executes a query evaluation process for generating the evaluation value based on a value of a corresponding query for each of the stored provision information.
An information retrieval apparatus characterized by that. In claim 1 or 2,
The control means enables index creation processing for creating and storing index information in which a certain query x is used as an index and a set of provided information and the evaluation value is associated with the query x, and
In the provided information presentation order process, the query A is referred to the index information to identify a set of the provided information and the evaluation value of the query A, and the presentation order is determined based on the identified set.
An information retrieval apparatus characterized by that. An information search method for outputting provided information based on an input query by a computer having means for communicating with a user terminal and storage means,
It said storage means stores a correspondence relationship between the evaluation value and the query and the provided information, the evaluation value is a description of the superiority or inferiority relationships between query corresponding to each of the provided information,
The computer executes provided information presentation order processing and provided information output processing,
When the query A is input from the user terminal, the provision information presentation order process specifies the provision information corresponding to the query A, and the evaluation value of the query A corresponding to each of the identified provision information To determine the order of presentation of the identified offer information,
The provision information output process outputs the specified provision information to the user terminal according to the presentation order;
An information search method characterized by that.

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