Patent ID: 8242882

Claim:
A biometric authentication apparatus, comprising: a data retention part configured to retain a plurality of first biometric data items extracted from a plurality of living body parts of a user to be authenticated in correlation with a collation order of the first biometric data items; a collation part configured to acquire a second biometric data item from the user, to compare and collate the acquired second biometric data item with the first biometric data items in a descending order of collation priorities of the first biometric data items based on the collation order, and to determine that the user has been successfully authenticated in response to detecting one of the first biometric data items whose match rate with the second biometric data item exceeds a predetermined value; and a collation order change part configured to change the collation order in response to detecting, from a state of usage of the one of the first biometric data items used in the successful authentication, that the user has steadied at a change of a living body part thereof to use for authentication.