Connection is established from a communication device having a plurality of platforms, such as a push-button-type telephone 13, a personal computer 14 and a cellular phone 15, to a base station 12 through a public line network 22 and the Internet 20, and an operation guidance is given by means of a voice guidance or a Web page from base station 12, so that the base station 12 remote-controls an electric apparatus 11 in accordance with the user's operation on the communication devices 13 to 15. The guide program, voice guidance and Web pages in the base station 12 are made to be updateable in storing operations 24a, 27a, 27b, 27c in the base station 12, so that it is possible to easily add a function thereto and also change the functions. It becomes possible to correspond to various platforms, easily add various functions, and also to easily update the operation menu.