An entrance and in-store matching unit searches a first mismatched face image that is not matched with a face image captured at an entrance from all face images, which are captured in a store and registered in a biological information DB. An entrance and exit matching unit searches a second mismatched face image that is not matched with a face image captured at an entrance from all the face images, which are captured at an exit and registered in the biological information DB. An exit and in-store matching unit searches a matched face image that is matched with the second mismatched face image among the first mismatched face images. An entrance information registration unit registers the searched matched face image in the biological information DB as the face image captured at the entrance. The present invention can be applied to a monitoring system.