Patent attributes
A biometric authentication method is executed by a biometric authentication system comprising a server device to store biometric data of a plurality of users in a registering unit; and a client device to retain the biometric data sampled from the user and authenticated by the server device in a retaining unit together with user information. The method comprises verifying the biometric data sampled from the user with the cache biometric data retained in the retaining unit when in authentication; acquiring synthesized information of the cache biometric data of which the verification gets successful and the biometric data sampled from the user; and authenticating the synthesized information by use of the biometric data specified by the user information of the biometric data of which the verification gets successful in plural sets of biometric data registered in the registering unit.
