| 摘要 |
PROBLEM TO BE SOLVED: To improve narrow-down accuracy of search results.SOLUTION: A server device 10 receives designation of a keyword, and searches a file in which the designated keyword hits. The server device 10 also creates an appearance map by setting presence or absence of an appearance of the designated keyword for each file or each metadata of file according to a search result of the file. Further, the server device 10 extracts a keyword that the number of search results of combination with the designated keyword reaches a predetermined number by using the appearance map of the designated keyword and an appearance map of the keyword for combining with the designated keyword. Besides, the server device 10 determines validity of combination of the extracted keyword with the designated keyword. Furthermore, the server device 10 presents the keyword determined it has the validity. |
