Abstract: An authentication-selection system includes an authentication-means selector 26 which selects one among a plurality of authentication and one or more combinations of the authentication, using at least one of authentication means for authenticating person. Preferably, a combination generator 24 for generating the one or more combinations of the authentication using at least one authentication means for authenticating person; and a calculator 25 for calculating authentication performance for each of the plurality of authentication and the one or more combinations of the authentication are further provided. An authentication system includes the above authentication-selection system and at least one authentication means 11 for authenticating person. Thereby, there is provided an authentication-selection system for selecting one among the plurality of authentication and the one or more combinations of the authentication satisfying target performance required for authentication.