To provide a center device for accommodating a variety of situations which may occur when a home-use game machine, or the like, is used, in which a plurality of users use their own controller devices such as an input device. A center device communicates with a plurality of devices in either a wired or radio manner, receives an instruction operation from a user of each device, and carries out a process based on the instruction operation, the plurality of devices each having unique identifier, including: a unit that obtains an identifier of a device; a unit that provides information concerning the device, the identifier of the device is not associated with the identifier of the user; and a unit that associates the identifier of the device selected by the user, the identifier of the user is already associated with the identifier of another device, with the identifier of the user.