In the present invention, an image acquisition unit (106) acquires a captured image from an imaging device. A face authentication unit (132) detects a face image of a registered user in the captured image using face recognition data held in a registered user information holding unit (180). A damage determination unit (142) determines whether or not the face recognition data read out by a face data readout unit (130) from the registered user information holding unit (180) is damaged. When the face recognition data is determined to be damaged, a notification unit (144) produces a notification that that the face recognition data is damaged.
