A remote operating system capable of operating a given home electric appliance by simple operation from a portable telephone is disclosed. A service equipment connected to an internet and a public network provides a home page using the function of a portable telephone to browse the internet home pages. An instruction to operate the home electric appliance is given by way of the home page using the portable telephone. Thus, an operating instruction is given through the public network to a remote operation adaptor installed in a home to control the home electric appliance.