| 摘要 |
PURPOSE: To automatically display what character a set of documents narrowed down at present has by obtaining the number of documents to which keywords are given with respect to a set of keywords given to the set of narrowed-down documents and displaying them in the frequency order. CONSTITUTION: The keyword inputted by a user input and display module 210 is transferred to a keyword retrieval engine 208 to retrieve an ID index 204 to the keyword, and a set of IDs of pertinent documents is returned. The keyword retrieval result (the number of retrieved documents, titles, or the like) is displayed in individual windows by the module 210. Obtained keywords are sorted in the descending order based on counted values by a keyword collection and sort module 212 and are displayed by the module 210. A list of keywords sorted in the descending order in this manner is watched to find what character the set of narrowed-down documents has.
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