Patent ID: 8863259

Claim:
A control method of controlling a biometric authentication system including a server that stores reference biometric data used as a reference for authentication of a user, and a client that acquires biometric authentication data from the user, the control method comprising: saving, in the server, associated information in which identification information identifying the user and a previous authentication result of the user are associated with each other; transmitting the identification information identifying the user to the server from the client; referring to, at the server, the identification information transmitted from the client and acquiring a previous authentication result of the user corresponding to the identification information from the saved associated information; calculating, at the server, an authentication success rate of the user from the acquired previous authentication result; determining, at the server, to calculate a degree of matching at the client when the calculated authentication success rate does not satisfy a threshold, and to calculate the degree of matching at the server when the calculated authentication success rate satisfies the threshold; transmitting, when said determining determines to calculate the degree of matching at the client, the reference biometric data from the server to the client and then calculating, at the client, the degree of matching between the biometric authentication data and the reference biometric data transmitted from the server, so that the degree of matching is thereby calculated at the client when the authentication success rate does not satisfy the threshold; and determining, based on the degree of matching calculated at the client, whether or not the authentication of the user has succeeded.