Abstract: To enhance convenience in an authentication system using a plurality of types of authentication, a terminal device transmits authentication data including a face image and a voice of a user, the position of the terminal device, to the server device. The server device uses the received authentication data to perform individual authentications including face authentication, voiceprint authentication, position adequacy verification. The server device applies adds up weighted scores of the individual authentications to calculate a comprehensive score. When the comprehensive score exceeds a first threshold, a high security operation is permitted. When the comprehensive score is not higher than the first threshold and exceeds a second threshold, a low security operation is permitted.

Abstract: An authentication system includes user information acquisition circuitry configured to acquire user information of a user, the user information including image information of the user or voice information of the user; authentication information extraction circuitry configured to extract, from the user information, authentication information corresponding to a plurality of types of authentication; and authentication circuitry configured to perform an authentication procedure, using the authentication information, to authenticate the user.

Abstract: An authentication system that includes a memory and processing circuitry. The processing circuitry is configured to manage a plurality of items of authentication information for authenticating a user; determine a usage type; select an authentication type, from among a plurality of authentication types, corresponding to the usage type; perform an authentication process for the user based on the authentication type; and output a result of authentication of the user.