| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To simply, precisely retrieve literatures, having information on matters similar to objects to be investigated, from a document database 18. <P>SOLUTION: Partial documents 30, to which items 29 designated in a plurality of documents 28 for investigation having information on objects to be investigated are attached, are clustered for each item, and keywords 32 including the clusters are extracted for each cluster 31 in each item from the results of the clustering. Then, keywords 32 belonging to each item 29 are mutually combined to generate a plurality of search formulas, and the document database 18 is searched in which various kinds of documents are stored, with the generated search formulas. An investigation map 11 is generated, which has keywords of one item in its columns and keywords of another item in its rows, wherein the keywords constitute the search formulas, and the search results 35 are each arranged in matrix forms at the intersection points in the map, and then the investigation map 11 is outputted. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
