Patent ID: 7769210

Claim:
A biometric authentication device for generating biometric data on the basis of biometric information of a user and for authenticating the user on the basis of a reference biometric data of the user, the biometric authentication device comprising: a storage unit for storing the reference biometric data and working reference biometric data; and a central processing unit for controlling a process of maintaining reference biometric data to be carried out by the biometric authentication device, the process comprising: initializing the working reference biometric data by copying the reference biometric data; obtaining new biometric data on the basis of new biometric information; performing authentication by comparison of said new biometric data with said working reference biometric data, and upon successful authentication, updating the working reference biometric data by copying said new biometric data; calculating a matching ratio of the reference biometric data and the updated working reference biometric data; and urging the user to carry out registration of reference biometric data when the matching ratio is equal to or lower than a predetermined value.