Hitachi, Ltd.

Tsuyoshi Sudou

Natsuko Sugaya

Tadataka Matsubayashi

Michio Iijima

Shinya Yamamoto

Yuichi Ogawa

Yuuki Watanabe

Information that individual elements (characteristic character strings) indicative of characteristics of a registered document appear in the registered document is stored in advance. When calculating similarity of the registered document, a query designated by a searcher is analyzed. The query is represented by a characteristic vector having the individual elements which take the relation between a plurality of words into consideration. Pieces of appearance information of the individual words contained in the query are counted. The counted appearance information is compared with a searching index to calculate similarity between documents.

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Ichikawa, Japan

Tsuyoshi Sudou