PURPOSE: To accurately collate an individual by collating the individual with questions to which answers are different according to psychological conditions.

CONSTITUTION: A psychological fuzzy rule 5 related questions and answers of ambiguous conception is preliminarily stored, and these questions are presented, and membership functions indicating degrees of identity are preliminar ily generated in a membership function generating part 3 in accordance with answers to generate collation data of individuals. At the time of collation, these questions are presented, and fuzzy inference is performed in an inference part 6 by answers, membership functions, and the fuzzy rule 5, and an individual is identified in accordance with inference results. Thus, the individual is accurate ly collated.