An apparatus for controlling devices in one or more home networks is provided. The apparatus includes an authentication unit, a control message generation unit, a control message transmission unit, a response message reception unit, and an information management unit. The authentication unit performs authentication with one or more relay devices each connected to a plurality of devices through a network. The control message generation unit generates a control message in response to a user input. The control message transmission unit transmits the generated control message to a device selected by the user from among the plurality of devices. The response message reception unit receives a response message responding to the transmitted control message. The information management unit manages information about the relay devices and the plurality of devices.