Abstract: To detect an unauthorized access easily, conveniently, and reliably, an unauthorized access detection system stores data indicating an access destination of an unauthorized access to be detected, detects an access request, determines whether an access source indicated by the access request matches an access source stored in advance and also whether an access destination indicated by the access request matches the data stored, suspends an access to the access destination requested by the access request if it is determined that the access source indicated by the access request matches the access source stored in advance and also that the access destination indicated by the access request matches the data stored, receives an input of biometric information from a user, performs authentication based on the biometric information inputted, and controls the suspended access according to a result of the authentication.