An identifier control device includes: a cumulative transmission and reception initiation control unit that instructs a plurality of controlled devices, via a network, to initiate cumulative transmission and reception; a distance determination command transmission unit that transmits to each of the plurality of controlled devices via the network a distance determination command; a distance recognition unit that determines the distances on the network with respect to the respective plurality of controlled devices, based on response signals transmitted by the respective plurality of controlled devices after the accumulation time has elapsed from when each of the plurality of controlled devices receives the distance determination command; and an identifier control unit that sets to each of the plurality of controlled devices, via the network, an identifier for each of the plurality of controlled devices determined based on the determined distances on the network.