An information processor is disclosed that includes an authentication part configured to authenticate a user based on predetermined information; an information obtaining part configured to obtain first information to be used to authenticate the user from an external device; and an authentication control part configured to cause the authentication part to authenticate the user by inputting information based on the first information to the authentication part as the predetermined information. The information obtaining part is configured to obtain the first information using a program module whose correlation with the information obtaining part is recorded in a recording medium.