A method and apparatus for updating the software of a device that is a controlled device linked to a control device over a network. According to the method, a control device obtains information regarding updating of the software of a controlled device, determines whether updating is available using the information, and allows the controlled device to update its software, thereby easily updating the software of device. The apparatus can be a network device, connected to an update server and another network device in a network, for updating software of the other network device. The network device can include a control circuit configured to determine whether the updating of the software is required based on update information; and a transceiving unit configured to communicate with the other network device and the update server.