JPH05314181A - Information retrieving device - Google Patents

Abstract

PURPOSE:To provide an information retrieving device by which the operating efficiency of a text retrieval can be further improved in the information retrieving device which retrieves the number of times key words inputted by a user are used in an object text (document). CONSTITUTION:The device is equipped with a key word fetching means 10 which fetches the key words inputted by the user, key word dividing means 12 which divides the fetched key words into the words of constitution units, unit word selecting means 14 which selects only the preliminarily registered words from the unit words obtained by the key word dividing means 12, composite word preparing means 16 which prepares composite words including the selected unit words, text retrieving means 18 which retrieves the number of times the prepared composite words are used in the objective text, and retrieved result presenting means 20 which presents the retrieved result of the text to the user.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information retrieval device for retrieving the number of times a keyword entered by a user is used in a target text.

According to this type of device, the number of times the keyword appears in the target text can be automatically searched at extremely high speed simply by inputting the keyword.
It is possible to significantly simplify the management and use of documents.

[0003]

2. Description of the Related Art When a user inputs a keyword of a compound word, the keyword is decomposed into constituent unit words (constituent words), and the number of times these constituent words (unit words) appear in a target text is searched. ..

[0004]

For example, when the user inputs "image processing device" as a keyword, this "
"Image processing device" is not a constituent word, but "image", "
When "processor" is a constituent word, the number of times that the constituent words "image" and "processor" appear in the target text is searched.

[0005] Therefore, the user has the constituent words "image", "
"Image" and "Processor" with a focus on "Processor"
It is necessary to give an instruction to perform a search with the logical product of, which reduces the work efficiency of the text search.

The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide an information search apparatus capable of further increasing the work efficiency of text search.

[0007]

In order to achieve the above object, the apparatus according to the first invention is configured as shown in FIG. 1, and has a keyword fetching means 10 for fetching a keyword inputted by a user and a fetching means. A keyword dividing unit 12 that divides the selected keyword into words of a constituent unit, a unit word selecting unit 14 that selects only a pre-registered word from the unit words obtained by the keyword division, and the selected unit word are included. A compound word generation means 16 for generating a compound word, a text search means 18 for searching the number of times the generated compound word is used in the target text, and a search result presentation means for presenting the result of the search to the user. 20 and.

The apparatus according to the second aspect of the present invention is configured as shown in FIG. 2, and has a keyword fetching means 10 for fetching a keyword inputted by a user and a keyword dividing means for dividing the fetched keyword into words as constituent units. 12 and
A unit word selection unit 14 that selects only a pre-registered word from the unit words obtained by the keyword division; a first compound word generation unit 16 that generates a compound word including the selected unit word; A synonym generating means 22 for generating a synonym word with the compound word generated by the first compound word generating means 16; a second compound word generating means 24 for generating a compound word including the generated synonym word; It has a text search means 18 for searching the number of times the compound word generated by the second compound word generation means 24 is used in the target text, and a search result presenting means 20 for presenting the search result to the user.

Further, the apparatus according to the third aspect of the invention is configured as shown in FIG. 3, and the keyword fetching means 10 for fetching the keyword inputted by the user and the keyword dividing means for dividing the fetched keyword into the words of the constituent unit. 12
A unit word selecting means 14 for selecting only words that are registered in advance from the unit words obtained by keyword division; and a first compound word generating means 16 for generating a compound word including the selected unit word. , The generated word presenting means 26 for presenting the generated compound word to the user, the presented word selecting means 28 for selecting the word instructed by the user from the presented compound word, and the selected compound word in the target text. It has a text search means 18 for searching the number of times of use and a search result presentation means 20 for presenting the result of the search to the user.

The apparatus according to the fourth aspect of the present invention is configured as shown in FIG. 4, and has a keyword fetching means 10 for fetching a keyword inputted by a user and a keyword dividing means for dividing the fetched keyword into words as constituent units. 12
A unit word selecting means 14 for selecting only words that are registered in advance from the unit words obtained by keyword division; and a first compound word generating means 16 for generating a compound word including the selected unit word. , A second synonym generating means 22 for generating a synonym of the synonym generated by the first compound word generating means 16 and a second synonym generating a compound word containing the synonym generated by the synonym generating means 22. A generation unit 24, a generated word presentation unit 26 that presents the compound word generated by the second compound word generation unit 24 to the user, and a presentation word selection unit 28 that selects a word designated by the user from the presented compound words. The text search unit 18 searches the number of times the selected compound word is used in the target text, and the search result presentation unit 20 presents the search result to the user.

The apparatus according to the fifth aspect of the invention is configured as shown in FIG. 5, and the first keyword fetching means 10 for fetching the keyword inputted by the user and the fetched keyword are divided into the words of the constituent unit. A keyword dividing unit 12, a unit word selecting unit 14 that selects only pre-registered words from the unit words obtained by the keyword division, and a first compound that generates a compound word that includes the selected unit word. The word generation unit 16, the generated word presentation unit 26 that presents the generated compound word to the user, the presentation word selection unit 28 that selects the word instructed by the user from the presented compound words, and the compound word selection. The second keyword capturing means 30 for capturing a new keyword input by the user at the time of writing, and the target compound text for both the selected compound word and the newly captured keyword In a text search unit 18 for searching the number in use, the search result display unit 20 for presenting the results of a search to the user.

Further, the apparatus according to the sixth aspect of the invention is configured as shown in FIG. 6, and the first keyword fetching means 10 for fetching the keyword inputted by the user and the fetched keyword are divided into the words of the constituent unit. A keyword dividing unit 12, a unit word selecting unit 14 for selecting only pre-registered words from the unit words obtained by the keyword dividing, and a first compound word for generating a compound word including the selected unit word. Generating means 16, synonym generating means 22 for generating a synonym of the compound word generated by the first compound word generating means 16, and second compound word generating for generating a compound word including the generated synonym word. A means 24, a generated word presentation means 26 for presenting the compound word generated by the second compound word generation means 24 to the user, and a presented word selection means 28 for selecting a word designated by the user from the presented compound words. The second keyword capturing means 30 for capturing a new keyword input by the user when the compound word is selected, and both the selected compound word and the newly captured keyword are used in the target text. It has a text search means 18 for searching the number of times of search and a search result presentation means 20 for presenting the result of the search to the user.

[0013]

In the first aspect of the present invention, when the user inputs a keyword, the keyword is divided into unit words (constituent words), and those that can be keywords in these unit words are selected.

Further, a compound word including the selected unit word is generated as a new keyword, the number of times the keyword of the generated compound word is used in the target text is searched, and the search result is displayed to the user. Presented.

In the second invention, when a unit word that can be a keyword is selected and a compound word is generated, a synonym of this compound word is generated and a compound word including the synonym word is generated as a keyword for text search. To be done.

In the third invention, when the unit words are generated and the compound words are generated, the compound words are presented to the user, and the text search is performed using the compound word selected by the user from the presented words. ..

In the fourth invention, when a unit word is selected and a compound word is generated, a synonym of the compound word is generated and a compound word including the synonym word is further generated and presented to the user. ..

The user selects a necessary one from the presented compound words, and when the selection is made, the number of times the compound word selected by the user is used in the target text is searched and the search result is obtained. Presented to the user.

In the fifth aspect, when a unit word is selected from a keyword input by the user and a compound word is generated, the generated compound word is presented to the user and a necessary compound word is presented from the one presented by the user. When a user inputs a new keyword at that time, the number of times of use is searched by the logical product of the selected compound word and the new keyword, and the search result is presented to the user.

In the sixth invention, when a unit word is selected from a keyword input by a user and a compound word is generated, a synonym of the compound word is generated and the compound word is further generated and presented to the user. ..

The user selects a necessary one from the presented compound words and inputs a new keyword, and the apparatus performs a search with a logical product of the selected compound word and the newly input keyword to obtain a search result. Present to the user.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an information retrieval apparatus according to the present invention will be described below with reference to the drawings. The overall configuration of the embodiment is described in FIG. 7, in which the database storage unit 70 includes a database creation processing unit 72 and a database search processing unit 7.
4 and are accessed.

The database search processing unit 74 is provided with data necessary for text search from the input / output processing unit 76, and the data showing the text search result is sent from the database search processing unit 74 to the input / output processing unit 76. Is output.

FIG. 8 illustrates the structure of the database storage unit 70. In the database storage unit 70, a word division dictionary 78 and a keyword recognition rule table which are accessed by the database creation processing unit 72 and the database search processing unit 74, respectively. 80, a compound word correspondence table 82, a synonym correspondence table 84, a compound word correspondence table 86, and a keyword / text correspondence table 88 are provided.

FIG. 9, FIG. 10, FIG. 11, FIG. 12, FIG.
FIG. 14 shows the contents of the word division dictionary 78, the keyword recognition rule table 80, the compound word correspondence table 82, the synonym correspondence table 84, the compound word correspondence table 86, and the keyword / text correspondence table 88, respectively. Is a word division unit 90, a keyword recognition unit 92, a compound word decomposition unit 94 of the database creation processing unit 72 shown in FIG.
It is accessed from the synonym search unit 96, the compound word decomposition unit 98, and the index creation unit 100.

Further, the text input section 102 of the database creation processing section 72 has, for example, the number T0 shown in FIG.
Texts of 10, T020 and T030 are given, and these are sent from the text input unit 102 to the word dividing unit 90.

In FIG. 17, the operation of the database creation processing unit 72 is described. When text data is input from the text input unit 102 to the word dividing unit 90, the word dividing dictionary 78 (see FIG. 9) is used. The input text is divided into words that are constituent units (step 1700).

Next, the keyword recognition rule table 80
Words defined as nouns (see FIG. 10) are recognized as keywords, and only the words recognized as keywords are sent to the compound word decomposition unit 94 (step 1702).

In the compound word disassembling unit 94, the keyword recognizing unit 9
The process of determining whether or not the keyword given from 2 is a compound word is performed using the compound word correspondence table 82 (see FIG. 11), and the keyword of the compound word is a keyword to a word of the constituent unit (a constituent word). Is decomposed as (step 1
704).

Further, the keyword of the constituent word obtained by the compound word decomposing unit 94 is sent to the synonym searching unit 96, and the synonym searching unit 96 finds the synonym of the constituent word keyword given from the compound word decomposing unit 94. Similar word correspondence table 84 (FIG. 12)
Reference) (step 706).

Further, the keywords of the constituent words and the similar words are sent from the synonym search unit 96 to the compound word decomposition unit 98, and the compound word decomposition unit 98 outputs the synonym of the compound word given from the synonym search unit 96. Compound word correspondence table 86 (see FIG. 13)
Is used to decompose the keywords into constituent words (step 1
708).

Then, the index creating section 100 performs a process of writing a record in which the keyword given from the compound word decomposing section 98 and the identification number of the text in which the keyword exists correspond to the keyword / text correspondence table 88, At this time, a count value indicating the appearance frequency of the keyword is written in the corresponding field of each record (step 1710).

FIG. 18 illustrates the configuration of the keyboard search processing unit 74. The keyword search processing unit 74 includes a word division dictionary 78 in the database storage unit 70, a keyword recognition rule table 80, a compound word correspondence table 82, and synonyms. The word division table 104, the compound word correspondence table 86, and the keyword / text correspondence table 88 are respectively accessed. A keyword matching unit 114 is provided.

Further, the configuration of the input / output processing unit 76 is described in FIG. 19, and the input / output processing unit 76 is provided with a keyword input unit 118, a result display unit 120, and a data selection unit 120.

The keyword input unit 118 of the input / output processing unit 76 is operated by the user, and the operation modes A, B, and
C, D, E or F and keyword are keyword input section 1
It is input in advance from 18.

FIG. 20 illustrates the contents of the processing performed in this embodiment. When a keyword is input from the keyword input unit 118 (step 200), the word dividing unit 1
04 processing (step 2002), keyword recognition unit 1
Process 06 (step 2004), compound word creation unit 108
Processing (step 2006), processing by the synonym search section 110 (step 2008), processing by the composite creation section 112 (step 2010), and processing by the keyword matching section 114 (step 2012). B,
The result of the text search is displayed according to C, D, E or F, and is displayed on the result display unit 120 after sorting (step 2014).

In FIG. 21, the actions of modes A and B are shown in FIG.
Then, the display contents at that time are explained respectively, and the user of the apparatus operates the keyword input unit 118 to input the keyword after the mode input (step 2000).

The word division unit 1 of the database search processing unit 74
04 divides the input keyword into constituent words using the word division dictionary 78 (step 2002), and sends the keywords of the constituent words to the keyword recognizing unit 106.

The keyword recognizing unit 106 refers to the keyword recognizing rule table 80 and certifies only constituent words such as nouns as keywords (step 2004), and sends only the constituent words certified as keywords to the compound word creating unit 108. ..

The compound word generation unit 108 uses the compound word correspondence table 82 to generate a compound word from the constituent words of the keyword (step 2006). If mode A is designated, the compound word is obtained by keyword division. The constituent word and the generated compound word are sent to the keyword matching unit 114.

In this case, the keyword collating unit 14 accesses the keyword text correspondence table 88 using the constituent word and the compound word provided from the compound word creating unit 108 as keywords (step 2012), and the result of the input / output processing unit 76 is obtained. The display unit 120 sorts the search results (the number of cases) of the text indicating the number of appearances of the constituent word and the compound word, which are keywords, and displays the results (step 2014).

For example, in mode A, when the user inputs the keyword "image" as shown in FIG. 22, the keywords "image", "image processing", "color image", "real-time image processing", "image" are input. The processing results (the number of cases) of “extraction” and “distance image” are sorted and then displayed and output.

Therefore, by simply inputting "image" without inputting the keyword "image processing", it is possible to obtain the search result regarding the target "image processing" very easily and efficiently.

If the user specifies mode B,
The compound word generation unit 108 sends the constituent words obtained by the keyword division and the generated compound words to the synonym search unit 110, and the synonym search unit 110 uses these to access the synonym correspondence table 84, The corresponding synonyms are searched (step 2008).

Then, the synonym search unit 110 compares the given constituent word and compound word and the searched synonym word with the compound word creation unit 1.
12, the compound word generator 112 accesses the compound word correspondence table 86 using them, and generates a compound word including them (step 2010).

Further, the compound word creation unit 112 sends the given constituent words, compound words, synonyms and generated compound words to the keyword matching unit 114, and the keyword matching unit 114 gives the given compound words and compound words. , The keyword / text correspondence table 88 is accessed using the synonyms and their compound words as keywords (step 2012).

In FIG. 23, the processing of mode B is described. When the user inputs the keyword "image", the compound word "image processing" is generated, and the synonyms "image" and "image" are generated.
The "processor" is generated, and the compound words "image processor" and "image processor" are obtained together with "image", "image processing", and "image".

FIG. 24 shows a display example at that time. When the user inputs the keyword “image” as shown in FIG. 24, the “image”, the compound image “image processing”, and the synonym “” are displayed. A search is performed by "image", "processor", "processor", compound word "image processor", "image processor", and the search results (the number of results) are sorted and displayed.

In this way, the user can easily obtain the target compound word "image processor" including the synonym "image" by simply inputting "image".

In FIG. 25, the operation when the mode C and the mode D are specified is explained. When the user inputs a keyword (step 2000), the keyword is divided into words (step 2002), certified (step 2004),
The process of creating a compound word (step 2006) is performed (the same applies to the D mode).

Then, all the compound words generated by the compound word generating section 108 are displayed on the result display section 120 (step 20).
14), the user operates the data selection unit 122 to select one from the displayed compound words.

The keyword collating unit 114 uses the compound word selected by the user to generate the keyword / text correspondence table 8
8 is accessed (step 2012), and the result display unit 12
0 sorts the search results of the keyword matching unit 114 and outputs them to the user for display (step 2014).

For example, as shown in FIG. 26, the user can select "image".
When inputting, the keyword “image” of the compound word, “keyword of image processing”, “color image”, “real-time image processing”, “image extraction”, and “distance image” are displayed and output together with the input keyword “image”. When "Image processing" is selected, the search result (number of cases) is displayed.

Therefore, the user can obtain the search result extremely easily and efficiently by simply inputting "image" and selecting an appropriate one from the display list of the compound words including this.

When the mode D is designated, the process of creating a compound word (step 2006) is performed, and then the process of searching a synonym (step 2008) and creating a compound word (step 2010). The keyword input by the user, the compound word generated by the compound word creation unit 108, the synonym searched by the synonym search unit 110, and the synonym / compound word generated by the compound word creation unit 112 are displayed in the result display unit 120. Is displayed on the screen (step 2014).

The user selects an appropriate one from these keywords output as a list on the result display section 120 as shown in FIG. 27, and the keyword collating section 114 accesses the keyword / text correspondence table 88 by the selected keyword. (Step 2012).

As described above, the selection range of the keyword is expanded to include the keyword similar to the keyword input by the user and the compound word thereof, so that the user can specify a more appropriate keyword.

In FIG. 28, the operation of modes F and E is explained. When the user inputs a keyword in mode E (step 2000), word division (step 2002),
Keyword recognition (step 2004) and compound word creation (step 2006) are performed, and the input keyword and the generated compound word keyword are displayed and output to the user (step 2014).

The user selects an appropriate keyword from the displayed and output keywords, and the keyword collating unit 114 accesses the keyword / text correspondence table 88 using the selected keyword (step 2012).

However, when the user selects one of the displayed keywords when the first search result is displayed and then inputs a new keyword (step 2000), the logical product of both keywords is used as the keyword / The text correspondence table 88 is accessed (step 20).
12).

For example, in FIG. 29, "image processing" is selected from the keyword list and a new keyword "noise" is selected.
When "" is input, the result (the number of cases) of the search based on the logical product of both keywords "image processing" and "noise" is used, and therefore, the narrowed-down search can be performed more flexibly and easily.

When the mode F is designated, similar words and their compound words are also displayed as keywords as a list as shown in FIG. 30 (step 2014), and the user selects an appropriate one from the displayed list of keywords, A new keyword is input (step 2000).

In this way, the keywords of the synonyms and the compound words thereof are also displayed in a list, so that it becomes possible to select an appropriate keyword by narrowing down and perform the search operation more efficiently.

[0064]

As described above, according to the present invention, a compound word of a keyword input by a user, a similar word, and a compound word of similar words can be generated as keyword candidates used for actual retrieval, and they can be generated. A proper keyword can be selected as a keyword to be used for the actual search, or a narrowing condition can be added. Therefore, the text search can be performed more easily and efficiently and flexibly and without error.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the first invention.

FIG. 2 is a diagram illustrating the principle of the second invention.

FIG. 3 is a diagram illustrating the principle of the third invention.

FIG. 4 is an explanatory view of the principle of the fourth invention.

FIG. 5 is a diagram illustrating the principle of the fifth invention.

FIG. 6 is an explanatory view of the principle of the sixth invention.

FIG. 7 is an explanatory diagram of the overall configuration of the embodiment.

FIG. 8 is an explanatory diagram of a configuration of a database storage unit.

FIG. 9 is an explanatory diagram of contents of a word division dictionary.

FIG. 10 is an explanatory diagram of contents of a keyword recognition rule table.

FIG. 11 is an explanatory diagram of contents of a first compound word correspondence table.

FIG. 12 is an explanatory diagram of contents of a synonym correspondence table.

FIG. 13 is an explanatory diagram of contents of a second compound word correspondence table.

FIG. 14 is an explanatory diagram of contents of a keyword / text correspondence table.

FIG. 15 is a diagram illustrating the configuration of a database creation processing unit.

FIG. 16 is an explanatory diagram of contents of input text.

FIG. 17 is a flowchart illustrating an operation of the database creation processing unit.

FIG. 18 is a diagram illustrating a configuration of a keyword search processing unit.

FIG. 19 is a diagram illustrating the configuration of an input / output processing unit.

FIG. 20 is a diagram illustrating the processing contents of the embodiment.

FIG. 21 is an explanatory diagram of an operation in A mode and B mode.

FIG. 22 is an explanatory diagram of a display in A mode.

FIG. 23 is an explanatory diagram of processing contents in B mode.

FIG. 24 is a diagram illustrating a display in B mode.

FIG. 25 is a diagram illustrating the operation in C mode and D mode.

FIG. 26 is an explanatory diagram of display in C mode.

FIG. 27 is a diagram illustrating the display in D mode.

FIG. 28 is an explanatory diagram of an operation in E mode and F mode.

FIG. 29 is an explanatory diagram illustrating a display in E mode.

FIG. 30 is an explanatory diagram illustrating a display in F mode.

[Explanation of symbols]

 70 database storage unit 72 database creation processing unit 74 database search processing unit 76 input / output processing unit 78 word division dictionary 80 keyword recognition rule table 82 compound word correspondence table (first) 84 synonym word correspondence table 86 compound word correspondence table (first 2) 88 keyword / text correspondence table 90 word division unit 92 keyword recognition unit 94, 98 compound word decomposition unit 96 synonym search unit 100 index creation unit 104 word division unit 106 keyword recognition unit 108, 112 compound word creation unit 110 synonymous Word search unit 114 Keyword matching unit 118 Keyword input unit 120 Result display unit 122 Data selection unit

Claims (6)

[Claims] 1. A keyword fetching means (10) for fetching a keyword input by a user, a keyword dividing means (12) for dividing the fetched keyword into words as constituent units, and a unit word obtained by the keyword division. A unit word selection means (14) for selecting only pre-registered words, a compound word generation means (16) for generating a compound word including the selected unit word, and a generated text as a target text. Text retrieval means (18) for retrieving the number of times it is used, and retrieval result presentation means (2) for presenting the retrieval result to the user
0), and an information retrieval device characterized by comprising: 2. A keyword fetching means (10) for fetching a keyword inputted by a user, a keyword dividing means (12) for dividing the fetched keyword into words of a constituent unit, and a unit word obtained by the keyword division. Unit word selection means (14) for selecting only pre-registered words, first compound word generation means (16) for generating a compound word including the selected unit word, and first compound word generation A synonym generation means (22) for generating a synonym word with the compound word generated by the means (16), a second compound word generation means (24) for generating a compound word including the generated synonym word, A text search means (18) that searches the number of times the compound word generated by the second compound word generation means (24) is used in the target text, and a search result presentation means (2) that presents the search result to the user.
0), and an information retrieval device characterized by comprising: 3. A keyword fetching means (10) for fetching a keyword input by a user, a keyword dividing means (12) for dividing the fetched keyword into words of a constituent unit, and a unit word obtained by the keyword division. A unit word selection means (14) for selecting only pre-registered words, a compound word generation means (16) for generating a compound word including the selected unit word, and presenting the generated compound word to the user. A generated word presenting means (26), a presented word selecting means (28) for selecting a word designated by the user from the presented compound words, and a search for the number of times the selected compound word is used in the target text. Text search means (18) and search result presentation means (2) for presenting the search result to the user.
0), and an information retrieval device characterized by comprising: 4. A keyword fetching means (10) for fetching a keyword input by a user, a keyword dividing means (12) for dividing the fetched keyword into words of a constituent unit, and a unit word obtained by the keyword division. Unit word selection means (14) for selecting only pre-registered words, first compound word generation means (16) for generating a compound word including the selected unit word, and first compound word generation A synonym generation means (22) for generating a synonym of the compound word generated by the means (16), and a second compound word generation for generating a compound word including the synonym word generated by the synonym word generation means (22). Means (24), generated word presentation means (26) for presenting the compound word generated by the second compound word generation means (24) to the user, and presentation for selecting the word instructed by the user from the presented compound words Word selection means (2 And), and the text search means is selected compound word to search for the number of times used in the target text (18), the search result presentation means for presenting to the user the results of a search (2
0), and an information retrieval device characterized by comprising: 5. A first keyword fetching means (10) for fetching a keyword inputted by a user, a keyword dividing means (12) for dividing the fetched keyword into words of a constituent unit, and a keyword obtained by keyword division. A unit word selection means (14) for selecting only pre-registered words from the unit words, a compound word generation means (16) for generating a compound word including the selected unit word, and a generated compound word A generated word presenting means (26) for presenting to the user, a presented word selecting means (28) for selecting a word designated by the user from the presented compound words, and a new word input by the user when the compound word is selected. Second keyword importing means (3
0), a text search means (18) for searching the number of times that both the selected compound word and the newly imported keyword are used in the target text, and a search result for presenting the search result to the user. Presentation means (2
0), and an information retrieval device characterized by comprising: 6. A first keyword fetching means (10) for fetching a keyword inputted by a user, a keyword dividing means (12) for dividing the fetched keyword into words of a constituent unit, and a keyword obtained by keyword division. A unit word selecting means (14) for selecting only a word registered in advance from the unit words; a first compound word generating means (16) for generating a compound word including the selected unit word; A synonym generating means (22) for generating a synonym of the compound word generated by the compound word generating means (16) and a second compound word generating means (24) for generating a compound word including the generated synonym word. A generated word presentation means (26) for presenting the compound word generated by the second compound word generation means (24) to the user, and a presented word selection means (for selecting the word instructed by the user from the presented compound words). 28) and the compound word Second keyword capturing means for capturing a new user-entered keyword when-option is made (3
0), a text search means (18) for searching the number of times that both the selected compound word and the newly imported keyword are used in the target text, and a search result for presenting the search result to the user. Presentation means (2
0), and an information retrieval device characterized by comprising: