| 摘要 |
<P>PROBLEM TO BE SOLVED: To construct a menu suited for a sense of a reader by registering keywords used for a retrieval when the reader reaches a content, as menu items. <P>SOLUTION: A list of contents is displayed by a keyword retrieval and, when a content is selected therefrom and is displayed, the keywords, the content, and an access date/hour as retrieval results are recorded as a content selection history. The keywords of high frequency are displayed on a menu of a drill-down retrieval as menu items of the retrieval results and are used as retrieval conditions of the content. <P>COPYRIGHT: (C)2013,JPO&INPIT |
