Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Takashi Muramatsu

Hiroshi Fujise

Mitsunobu Tasaka

Kazuhiro Satoh

Masayuki Tsuchiya

A data retrieving method and apparatus capable of narrowing the range of retrieved data without changing the retrieving condition equation, capable of retrieving data by designating relative conditions, and capable of providing indices for helping a user to judge the properness of retrieved results. The data retrieving apparatus includes a term defining unit for defining a fuzzy term designated by a user and related terms and assigned to an item to be retrieved, by setting a retrieving condition range for each of the terms and a distribution curve representing an optimum distribution within the retrieving condition range for each term, a satisfaction degree evaluating unit for calculating a satisfaction degree of the retrieved data by using a function allocated to the distribution curve, and a condition analyzing unit for transforming the fuzzy term into numerical values to obtain a value-based retrieving condition equation.

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Yokohama, Japan

Takashi Muramatsu