Patent ID: 8572396

Claim:
A biometric authentication device that performs a biometric authentication, the biometric authentication device comprising: a receiving unit that receives a request to identify an object to be authenticated, and determines whether the request is assigned to a one-to-one authentication or a one-to-N authentication according to whether or not the request includes an identification information of the object with first biometric information of the object; a first authentication unit that, when the request includes the identification information of the object to be assigned to the one-to-one authentication, acquires second biometric information corresponding to the identification information from a first database in which biometric information of all objects to be authenticated is registered, collates the first biometric information received with the acquired second biometric information, and makes an authentication successful when the first biometric information matches with the acquired second biometric information; a transferring unit that transfers, when the first authentication unit makes the authentication successful, the second biometric information used in the successful authentication from the first database to a second database and stores the transferred second biometric information in the second database; and a second authentication unit that, when the request does not include the identification information to be assigned to the one-to-N authentication, makes an authentication successful when there is at least one piece of biometric information matching with the first biometric information received among the transferred second biometric information stored in the second database.