| 摘要 |
Attribute data of a plurality of types regarding items are registered in a data base (21) advance for each item. A retrieval condition (23) is set, the condition comprising a plurality of preconditions indicating desired conditions relating to at least some of the plural types of attribute data, and a connecting condition that connects these preconditions. Degrees of membership that indicate the degrees to which attribute data conforms to a set precondition are calculated in an operation control unit (24). In accordance with a set connecting condition, and with regard to calculated degrees of membership, at least one of a MEAN operation (25) for calculating a signal indicating a mean value of these degrees of membership, a MIN operation (26) for selecting a minimum signal from these degree of membership, and a MAX operation (27) for selecting a maximum value from these degrees of membership, and a signal representing degree of concurrence thus obtained is outputted. |
