| 摘要 |
In a personal authentication device, a storing unit of each group stores therein biometric information of the persons belonging to that group. When a subject is to be authenticated, an acquiring unit acquires subject biometric information that is biometric information of the subject. A collating unit decides whether the subject is authentic based on whether there is a match for the subject biometric information in the biometric information in the storing unit. If the subject is determined to be not authentic, the subject biometric information is collated with biometric information in the storing unit of another group.
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