This is a system having a personal identification function to perform a registering operation not as an explicit one. The system simplifies the confirmation of an identification result thereby to improve dictionary updating conveniences. A device control apparatus is configured to include a face identification processor, a device setting unit and an interactive processor. The device control apparatus is configured to acquire personal data on the face image of a user, to identify a person matching the acquired personal data, by comparing the acquired personal data and registered personal dictionary data, to display the face image, as matching the identified person, at the registration time on the basis of the registered personal dictionary data, to receive such confirmation information from the user as to confirm whether or not the displayed person is identical to the user, and to set device environment parameters matching the confirmed person.