JP2004334638A - Additional retrieval word acquiring apparatus and method, program for realizing same, and recording medium with its program stored - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an additional retrieval word acquiring device, an additional retrieval word acquiring method, a program for realizing the device and the method, and a recording medium in which its program is stored for acquiring a retrieval word to be added in retrieval to be successively performed by analyzing a retrieval log generated by a retrieval engine, and to efficiently apply a word relevant to things which are highly likely to be in the news as the retrieval word. <P>SOLUTION: This additional retrieval word acquiring system is provided with an extracting means for extracting records including a single retrieval word different from any of retrieval words according to all desired retrieval words in a retrieval log generated by a retrieval engine and a retrieval word acquiring means for acquiring the single retrieval word included in the extracted records in the descending order of the priority of those records. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention analyzes a search log generated by a search engine to obtain a search word to be added in a subsequent search, an additional search word acquisition device, an additional search word acquisition method, The present invention relates to a program realizing an apparatus and a method, and a recording medium storing the program.
[0002]
[Prior art]
The search engine accesses a database in which documents and the like are stored, and provides documents that match the search formula specified by the user or information about the documents.
Such a search expression is given as a logical expression including not only a single word such as “news” but also a plurality of words such as “news economy”.
Further, in a search site that provides a search service via the Internet or the like, the above plurality of words are generally identified as a search expression “news” AND “economic”, and as a result of a search based on the search expression, Documents related to both “news” and “economy” are provided.
[0003]
Further, in the process of using the search engine and the search site described above, if the search result obtained in advance is large, the search result is a new word added by the user (hereinafter, “ ).
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-218881 (abstract, claim 1)
[0004]
[Problems to be solved by the invention]
By the way, in the above-described conventional example, an additional search word to be applied when narrowing down search results must be appropriately designated by a user who intends to narrow down the search results.
Therefore, when the narrowing-down policy is determined and an additional search word suitable for the narrowing-down policy is recalled by the user, the “narrowing-down search” is efficiently and smoothly realized.
[0005]
However, for example, when information related to a highly topical thing should be efficiently searched at the time when “refinement search” is to be performed, recalling an appropriate additional search word is not always easy for the user, And it was often difficult.
As prior art related to the present invention, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-320419, a search log generated by a search engine (a search expression as an actual result, a time when the search expression is input) (Date and time, and information such as identification information and cookies of the user who input the search term included in this search expression.) Is referred to, and the “minimum difference in the time when the search term was input for each user” is referred to. There is a technique in which the smaller the is, the greater the degree of relevance between search terms included in the search expression is.
[0006]
However, in this prior art, two search terms having a small difference between the input times are related even though they are not physically related.
Therefore, of these search terms, a search term entered late is not always identified as an additional search term. Further, such prior art is capable of calculating a degree of relevance between two search words, but seeking an additional search word to be added to the two previously specified search words. Essentially couldn't.
[0007]
An object of the present invention is to provide an additional search word acquisition device, an additional search word acquisition method, a program, and a program that can efficiently apply words related to a highly topical thing as additional search words to be applied to “refinement search” and the like. It is intended to provide a recording medium.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the extraction unit includes, in the search log generated by the search engine, a record including a single search term different from any of these search terms in addition to all of the desired search terms. Is extracted. The search term acquiring means acquires a single search term included in the extracted records in descending order of priority of these records.
In other words, such a single search term is not included in the search terms applied to the search that was actually performed earlier by the search engine, and is not included in the search term having the higher priority described above. Selected automatically.
[0009]
Therefore, even if the user cannot recall, the search term to be applied to “refine search” or “retrieval of search” is applied by a large number of users in advance, and indicates a thing with high topicality. Words are set smoothly.
According to the second aspect of the present invention, the search word conversion means converts a desired search word into a set of individually related words. The extraction means includes, in a search log generated by a search engine, a search term including a single search term different from any of these terms, in addition to any of the terms individually associated with all of the desired search terms. Extract records containing. The search term acquiring means acquires a single search term included in the extracted records in descending order of priority of these records.
[0010]
That is, such a single search term is compared with a case in which the search log is obtained from “records including any single word together with“ all of the above-described desired search terms ”in the search log”. , The result of a similar search performed earlier is obtained from a record that is widely reflected.
Therefore, the efficiency and optimization of “narrow search” and “retrieval of search” to be performed by applying such a single search word are achieved.
[0011]
According to the third aspect of the present invention, the search term expansion unit expands the obtained single search word into a set of words related to the single search word.
In other words, such a single search term is compared to a case where the single search term is simply applied to “refinement search” or “retrieval of search”. It is effectively used for "retry".
[0012]
Therefore, the efficiency and optimization of “narrow search” and “retrieval of search” can be made.
According to the fourth aspect of the present invention, the extraction means includes, in the search log generated by the search engine, a record including a single search term different from any of these search terms in addition to all of the desired search terms. Is extracted. The search term acquisition means acquires a single search term individually included in the extracted record. The search word candidate notifying unit notifies the operator of the acquired single search word and / or a word related to the single search word. The man-machine interface means takes a man-machine interface relating to selection of either the search word or the word notified to the operator.
[0013]
That is, the above-described single search term is set not only to the search term included in the record having the high priority described above, but also to a word flexibly adapted to the user's judgment and intention.
Therefore, as compared with the first aspect of the present invention, the degree of freedom of “narrow search” and “retrieval of search” to which such a single search word should be applied is increased, and adaptation to various fields is performed. Becomes possible.
[0014]
In the invention described in claim 5, the search word conversion means converts a desired search word into a set of individually related words. The extracting means includes, in the search log generated by the search engine, a record including a single search term different from any of these terms in addition to any of the terms individually related to all of the desired search terms. Extract. The search term acquisition means acquires a single search term individually included in the extracted record. The search word candidate notifying unit notifies the operator of the acquired single search word and / or a word related to the single search word. The man-machine interface means takes a man-machine interface relating to selection of either the search word or the word notified to the operator.
[0015]
That is, the above-described single search term is set not only to the search term included in the record having the high priority described above, but also to a word flexibly adapted to the user's judgment and intention.
Therefore, as compared with the invention described in claim 2, the degree of freedom of “narrow search” or “retrieval of search” to which such a single search word should be applied is increased, and adaptation to various fields is achieved. Becomes possible.
[0016]
According to the invention described in claim 6, the search term acquisition means acquires a single search term individually included in the extracted records in descending order of priority of the records. The search word candidate notifying unit notifies the operator of the obtained single search word and / or a set of words related to the single search word in descending order of priority.
In other words, the man-machine interface related to the selection of a single search term described above is more efficient than a case where the single search term candidate is notified to the user without being associated with any of the priorities described above. It is realized with high accuracy and accuracy.
[0017]
Therefore, convenience is improved in addition to operability.
In the invention according to claim 7, the search term expanding means extends the selected single search term to a set of terms related to the single search term.
In other words, such a single search term is compared to a case where the single search term is simply applied to “refinement search” or “retrieval of search”. It is effectively used for "retry".
[0018]
Therefore, the efficiency and optimization of “narrow search” and “retrieval of search” can be made.
In the invention according to claim 8, the priority is assigned to each attribute of the extracted record.
That is, for any record extracted from the search log, as long as the above-described attribute can be identified, a single search word is selected in the order of desired priority corresponding to the attribute, or the single search word is selected. The user is notified of search word candidates.
[0019]
Therefore, the selection of a single search word to be applied in the “narrowing search” or the “retrieval of the search” or the man-machine interface related to the selection is performed based on reliable criteria.
According to the ninth aspect of the present invention, a single search term is applied to a search actually performed by a search engine in advance, similarly to the first aspect of the invention, even if the single search term is not appropriately designated by a user. Of the search words, the search word having the higher priority is automatically selected.
[0020]
Therefore, even if the user cannot recall, the search term to be applied to “refine search” or “retrieval of search” is applied by a large number of users in advance, and indicates a thing with high topicality. Words are set smoothly.
According to the tenth aspect, similarly to the second aspect, a result of a similar search performed by a search operation in advance is obtained from a record in which the result is widely reflected.
[0021]
Therefore, the efficiency and optimization of “narrow search” and “retrieval of search” to be performed by applying such a single search word are achieved.
In the invention described in claim 11, a single search word is not a search word included in a record having a high priority as described above, but is determined by the user's judgment and intention, similarly to the invention described in claim 4. Set to a word that is flexibly adapted.
[0022]
Therefore, the degree of freedom of “narrow search” or “retrieval of search” to which such a single search word should be applied is increased, and adaptation to various fields is possible.
In the twelfth aspect of the present invention, a single search term is not a search term contained in a record having a high priority as described above, but is determined by the user's judgment and intention, similarly to the fifth aspect of the invention. Set to a word that is flexibly adapted.
[0023]
Therefore, the degree of freedom of “narrow search” or “retrieval of search” to which such a single search word should be applied is increased, and adaptation to various fields is possible.
A program according to a thirteenth aspect of the present invention provides an additional search term acquisition device according to any one of the first to eighth aspects, wherein the extraction means, the search term acquisition means, the search term conversion means, the search term extension means, The computer is caused to function as all or a part of the search word candidate notification means and the man-machine interface means.
[0024]
Therefore, a computer that executes the program according to the present invention is a component of the additional search term acquisition device according to any one of claims 1 to 8.
A recording medium according to claim 14, wherein an extraction unit, a search word acquisition unit, a search word conversion unit, and a search word expansion unit that constitute the additional search word acquisition device according to any one of claims 1 to 8. A program for causing a computer to function as all or part of the search word candidate notification means and the man-machine interface means is recorded and readable by a computer.
[0025]
Such a program is configured as software to be executed by the above-described computer or a microprogram incorporated in the computer, and is distributed by being recorded on a detachable recording medium separate from such a computer. I can do it.
Therefore, a computer that reads and executes such a program from the recording medium according to the present invention is a component of the additional search term acquisition device according to any one of claims 1 to 8.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing first and second embodiments of the present invention.
In the figure, a display 12, a keyboard 13 and a mouse 14 provided for a man-machine interface are connected to a processor 11, and a search log database 15 and a tallying result database 16 described later are provided on an external storage of the processor 11. .
[0027]
FIG. 2 is an operation flowchart of the first embodiment of the present invention.
Hereinafter, the operation of the first embodiment of the present invention will be described with reference to FIGS.
The search log database 15 is recorded by a search engine in accordance with a search term (search expression) given in advance, and is configured as, for example, a row of records including the following fields as shown in FIG.
[0028]
・ "Search time" field that stores the time when the search word or search expression was given
-"Search expression" field in which the search word (or search expression containing this search word) is stored
A “user identifier” field indicating a user who has issued a search request indicating such a search term (search expression)
The aggregation result database 16 is, for example, configured as a row of records including the following fields, as shown in FIG.
[0029]
・ "Search expression" field that stores the sequence of search terms included in the above search expression
-"Use count" field that stores the total number of times the search engine was started (search request) based on the search formula
・ The "Number of users" field that stores the number of users who have started the search engine (issued a search request) based on the relevant search formula
Processor 11 takes a man-machine interface via display 12, keyboard 13 and mouse 14 and identifies a search request (including one or more search terms) given by a user under the man-machine interface. The following processing is performed.
[0030]
-Generate a search expression that includes the search term included in the search request.
-The search process is started by giving the search expression to the search engine.
In addition to the set of information given as a result of the search processing, a record including the above-described “search time”, “search expression”, and “user identifier” indicating the form of the search processing is stored in the search log database 15. Add.
[0031]
Further, when a period and an opportunity to perform the search log tallying process under the man-machine interface described above are given, the processor 11 performs the tallying process based on the following procedure.
(1) From the records of the search log database 15, all the records whose time indicated by the value of the “search time” field belongs to the above period are extracted.
[0032]
(2) The following processing is performed for each “search formula” included in these extracted records.
{Circle around (1)} The above-mentioned “number of times of use” is obtained as the total number of records in the “search expression” field corresponding to the “search expression”.
{Circle around (2)} The aforementioned “number of users” is obtained as the total number of unique “user identifiers” stored in the “user identifier” field of the search log database 15 together with the corresponding “search formula”.
[0033]
{Circle around (3)} A record including the “number of uses” and “the number of users” obtained in this way is added to the tallying result database 16 along with the corresponding “search formula”.
Further, after completing the above-described processing for all valid records included in the search log database 15, the processor 11 responds to the following new search request given under the aforementioned man-machine interface, and Perform processing.
[0034]
(A) All of the single or plural search words (hereinafter, simply referred to as “preceding search words”) included in the relevant new search request (hereinafter, simply referred to as identifier “a” for simplicity). ) Is obtained (FIG. 2 (1)).
(B) Among the records of the totaling result database 16, in the “search expression” field, a record that includes some search word w in addition to all of such “preceding search words” (hereinafter, referred to as “specific record”) .) Are extracted (FIG. 2 (2)).
[0035]
(C) The following values relating to these “specific records” are calculated (FIG. 2 (3)).
・ The average value m of the “Number of users” field of all “Specific records”_{a + 1}
The standard deviation k of the values in these "number of users" fields_{a + 1}
(D) Based on the following procedure, the priority of each of these "specific records" is calculated (FIG. 2 (4)).
[0036]
{Circle around (1)} The value n of the “number of users” field of the corresponding “specific record”_awSee
(2) This value n_aw, The average value m described above_{a + 1}  And standard deviation k_{a + 1}  , The number of users (= n_aw) ”Is larger, the priority v is larger._awIs calculated.
[0037]
v_aw= (N_aw-M_{a + 1}) / K_{a + 1}
(E) such priority v_awIs selected (FIG. 2 (5)).
(F) Among the search terms stored in the “search expression field” of the single “specific record”, a single search term that does not correspond to any of the “preceding search terms” (hereinafter “additional search”) (For the sake of simplicity, it is assumed that it is different from any of the "preceding search words") (FIG. 2 (6)).
[0038]
(G) A request for “refine search” or “retrieval of search” by applying this “additional search word” is given to the search engine (FIG. 2 (7)).
In other words, at the time of “narrow search” or “retrieval of search”, a search term that has been applied with the “preceding search term” in advance is automatically applied as “additional search term”. Is done.
[0039]
Therefore, according to the present embodiment, words that are applied by a large number of users and that indicate a topic with high topicality can be efficiently used by the user without recalling “additional search words”. Retry.
In the present embodiment, the “specific record” includes any search word w in the “search expression” field in addition to all of the above-mentioned “preceding search words” in the records of the aggregation result database 16. It has been extracted as a record.
[0040]
However, such a “specific record” is replaced with a “preceding search word string” composed of all of the above “preceding search words”. For example, all or a part of these “preceding search words” is as follows: By applying one or a plurality of “alternative preceding search word strings” generated by being replaced by any word (may be obtained by referring to a concept dictionary or the like), various forms are obtained. Efficiency and optimization may be achieved in conjunction with the realization of “narrow search” and “retrieval of search”.
[0041]
・ Synonyms
・ Antonym
・ Superordinate terms
・ Subordinate terms
Further, in the present embodiment, among the search terms stored in the “search expression field” of the “specific record” having the highest priority, a simple search term that does not correspond to any of the “preceding search terms” is simply used. One search word has been acquired as an “additional search word”.
[0042]
However, such an “additional search word” is, for example, similar to the process of generating the “alternative preceding search word string” described above, and is a synonym, antonym, or superordinate concept acquired under reference to a concept dictionary or the like. By being replaced with words, sub-concept words, etc., efficiency and optimization may be achieved along with the realization of “narrow search” and “retrieval of search” in various forms.
[0043]
Furthermore, in the present embodiment, both the calculation of the priority described above and the acquisition of the additional search term are performed by referring to all the records of the aggregation result database 16.
However, one or all of these processes may be performed, for example, by referring to only the records that satisfy all or a part of the following conditions among the records of the tally result database 16.
[0044]
・ The value of the “use count” field exceeds a predetermined upper limit.
-The value in the "Number of users" field exceeds a predetermined upper limit.
-The search term is included in the "search formula" field as a predetermined permutation.
If the attribute of “records to be referred to in the course of such processing among the records of the aggregation result database 16” is not defined under the above conditions, for example, the aggregation processing for generating the aggregation result database 16 is performed. May be performed in all or some of the following forms.
[0045]
The time at which the search was performed (indicated by the value of the “search time” field of the search log database 15) belongs to a desired period or time zone.
The user who has issued the search request (indicated by the value of the "user identifier" field of the search log database 15) is based on the desired attribute (the form of the contract with the user, the information passed from the user as a cookie, etc.) Specified).
[0046]
Further, in the present embodiment, each record of the search log database 15 includes only a “search time” field, a “search formula” field, and a “user identifier” field.
However, for example, when the number of users should be aggregated, such a record includes information such as a cookie delivered from each user along with a “user identifier” used for identifying the user. It may be.
[0047]
Further, in the present embodiment, each record of the tally result database 16 includes only a “search formula” field, a “number of uses” field, and a “number of users” field.
However, such a record may include, for example, only one of “the number of uses” and “the number of users”.
[0048]
Further, in the present embodiment, the tally result database 16 is generated by performing the above-described tally processing on all records of the search log database 15.
However, such a totaling process may be performed only on the records in which the value of the “search time” field belongs to a desired period, or as shown in FIG. May be individually obtained for a plurality of periods identified based on
[0049]
FIG. 5 is an operation flowchart of the second embodiment of the present invention.
Hereinafter, the operation of the second embodiment of the present invention will be described with reference to FIGS.
The feature of the present embodiment lies in the following processing procedure performed by the processor 11.
The processor 11 extracts all “specific records” based on the same procedure as in the first embodiment described above, and further performs the following processing.
[0050]
(A) The extracted “specific record” is notified to the user via the display 12 as one of the following forms (FIG. 5 (1)).
-A form showing a row of values of the "search formula" field of all "specific records" (a search term corresponding to the "preceding search term" may be excluded or indicated by a specific display attribute).
・ Priority v as described above_awIn the descending order, the values of the “search expression” field of all “specific records” (the search words corresponding to “preceding search words” may be excluded or may be indicated by specific display attributes) are sorted. , Or a form generated by merging
(B) Under a predetermined man-machine interface (for example, it may be a “graphics user interface” realized via the mouse 14 instead of the keyboard 13), such a form included in such a form The selection of the value of the "search formula" field is realized (FIG. 5 (2)).
[0051]
(C) A request for “narrow search” (or “retrieval of search”) by applying “additional search terms” included in the value of the selected “search expression” field is given to the search engine (FIG. 5). (3)).
That is, the “additional search word” is the priority v_awIs simply not the word contained in the “search formula” field of the “specific record” that is the largest, but is set to a word that flexibly adapts to the user's judgment and intention.
[0052]
Therefore, according to the present embodiment, the degree of freedom of “narrow search” and “retrieval of search” is increased, and adaptation to various fields is possible.
In each of the above-described embodiments, both the search log database 15 and the aggregation result database 16 are arranged in a predetermined storage area of the external storage device accessed by the processor 11.
[0053]
However, the present invention is not limited to such a configuration, and either or both of the search log database 15 and the aggregation result database 16 are arranged in a predetermined storage area of the main storage of the processor 11, for example. Alternatively, it may be configured as a database accessible via a LAN or the Internet.
Further, in each of the embodiments described above, the substance of the database engine is not disclosed in detail.
[0054]
However, such a database engine is not a feature of the present invention and can be realized by applying various technologies, and furthermore, a database engine accessible via a local area network, the Internet or other communication networks. Instead, for example, software that is directly executed by the processor 11 may be used.
[0055]
In each of the above-described embodiments, the above-described man-machine interface is realized via the display 12, the keyboard 13, and the mouse 14 provided as input / output devices of the processor 11.
However, such a man-machine interface is, for example, an information processing device (not limited to a personal computer or a workstation, but a PDA (Personal Digital Assistants)) capable of accessing the processor 11 via the Internet or other communication networks. May be realized via an input / output device provided in the system.
[0056]
Furthermore, each embodiment described above is configured as software executed by the processor 11.
However, the present invention is not limited to such a configuration, and all or a part of the above-described processing may be performed by dedicated hardware.
Further, the present invention is not limited to the above-described embodiment, and in the contrary to the present invention, various embodiments are possible, and some or all of the constituent devices are improved. May be.
[0057]
【The invention's effect】
As described above, according to the first and ninth aspects of the present invention, a search word to be applied to “narrow search” or “retrieval of search” is a large number of search words even if the user cannot recall it. Words that are applied by the user and that indicate things with high topicality are set smoothly.
Further, according to the second, third, seventh, and tenth aspects of the present invention, the efficiency and optimization of the “narrowed search” and the “retrieval of the search” to be performed subsequently are achieved.
[0058]
Further, according to the inventions described in claims 4, 5, 11, and 12, the degree of freedom of “narrow search” or “retrieval of search” to be performed subsequently can be increased, and adaptation to various fields is possible. Become.
According to the invention described in claim 6, convenience is enhanced in addition to operability.
Further, according to the invention described in claim 8, selection of a single search word to be applied at the time of “refining search” or “retrieval of search” or a man-machine interface related to the selection is performed based on a certain standard. Done.
[0059]
Further, a computer that executes the program described in claim 13 is a component of the additional search term acquisition device described in any one of claims 1 to 8.
Further, a computer that reads and executes the above-described program from the recording medium according to claim 14 is a component of the additional search term acquisition device according to any one of claims 1 to 8.
[0060]
Therefore, in the database system and the information retrieval system to which these inventions are applied, retrieval of highly topical information is realized accurately and quickly, and performance and added value are enhanced.
[Brief description of the drawings]
FIG. 1 is a diagram showing first and second embodiments of the present invention.
FIG. 2 is an operation flowchart of the first embodiment of the present invention.
FIG. 3 is a diagram showing a configuration of a search log.
FIG. 4 is a diagram showing a configuration of a tally result.
FIG. 5 is an operation flowchart of a second embodiment of the present invention.
[Explanation of symbols]
11 processor
12 Display
13 Keyboard
14 mouse
15 Search log database
16 Count Result Database

Claims (14)

Extracting means for extracting a record including a single search term different from any of these search terms, along with all of the desired search terms, among search logs generated by the search engine;
A search term acquisition unit that acquires a single search term included in the extracted records in descending order of priority of these records; Search word conversion means for converting a desired search word into a set of individually related words;
A record including a search term including a single search term different from any of these terms, in addition to any of the terms individually related to all of the desired search terms in a search log generated by a search engine. Extraction means for extracting
A search term acquisition unit that acquires a single search term included in the extracted records in descending order of priority of these records; The additional search term acquisition device according to claim 1 or 2,
An additional search term acquisition device, comprising: a search term extension unit for extending the acquired single search term into a set of terms related to the single search term. Extracting means for extracting a record including a single search term different from any of these search terms, along with all of the desired search terms, among search logs generated by the search engine;
Search term acquisition means for acquiring a single search term individually included in the extracted record,
A search term candidate notifying unit that notifies the operator of the obtained single search term and / or a term related to the single search term;
An additional search word acquisition device, comprising: a man-machine interface unit that takes a man-machine interface for selecting one of the search word and the word notified to the operator. Search word conversion means for converting a desired search word into a set of individually related words;
Extraction of extracting, from a search log generated by a search engine, a record including a single search term different from any of these terms, along with any term individually related to all of the desired search terms. Means,
Search term acquisition means for acquiring a single search term individually included in the extracted record,
A search term candidate notifying unit that notifies the operator of the obtained single search term and / or a term related to the single search term;
An additional search word acquisition device, comprising: a man-machine interface unit that takes a man-machine interface for selecting one of the search word and the word notified to the operator. The additional search term acquisition device according to claim 4 or claim 5,
The search term acquisition means,
Obtain a single search term individually contained in these records in descending order of priority of the extracted records,
The search word candidate notifying means,
And (b) notifying the operator of at least one of the obtained single search word and a word related to the single search word in descending order of the priority. apparatus. The additional search term acquisition device according to any one of claims 4 to 6,
An additional search term acquisition device, comprising: a search term expansion unit for expanding the selected single search term into a set of terms related to the single search term. The additional search term acquisition device according to any one of claims 1 to 3,
The priority is
An additional search term acquisition device, which is provided for each attribute of the extracted record. In the search log generated by the search engine, along with all the desired search terms, a record including a single search term different from any of these search terms is extracted,
A method for acquiring an additional search term, wherein a single search term included in the extracted records in descending order of priority of these records is acquired. Convert the desired search terms into a set of individually related terms,
A record including a search term including a single search term different from any of these terms, in addition to any of the terms individually related to all of the desired search terms in a search log generated by a search engine. Extract
A method for acquiring an additional search term, wherein a single search term included in the extracted records in descending order of priority of these records is acquired. In the search log generated by the search engine, along with all the desired search terms, a record including a single search term different from any of these search terms is extracted,
Obtaining a single search term individually included in the extracted record,
Notifying the operator of the obtained single search word and / or a word related to the single search word,
A method for acquiring an additional search word, wherein a man-machine interface for selecting either the search word or the word notified to the operator is used. Convert the desired search terms into a set of individually related terms,
A record including a search term including a single search term different from any of these terms, in addition to any of the terms individually related to all of the desired search terms in a search log generated by a search engine. Extract
Obtaining a single search term individually included in the extracted record,
Notifying the operator of the obtained single search word and / or a word related to the single search word,
A method for acquiring an additional search word, wherein a man-machine interface for selecting either the search word or the word notified to the operator is used. An extraction unit, a search word acquisition unit, a search word conversion unit, a search word expansion unit, a search word candidate notification unit, and a man-machine interface that constitute the additional search word acquisition device according to any one of claims 1 to 8. A program that causes a computer to function as all or part of the means. An extraction unit, a search word acquisition unit, a search word conversion unit, a search word expansion unit, a search word candidate notification unit, and a man-machine interface that constitute the additional search word acquisition device according to any one of claims 1 to 8. A computer-readable recording medium that records a program for causing a computer to function as all or a part of the means.

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