Abstract: A software update system includes a first server resided in a network different from a home network and has a storage device to store a software to be used for information equipment, and a second server resided in a network different from the home network and has an information equipment control unit that requests a software version to the information equipment, and a service control unit that requests a software version to the first server and compares the software version acquired from the information equipment with the software version acquired from the first server, which uniformly manages the information equipment by an internet service provider (ISP), in which ISP uses a standardized DHCP scheme and MAC address as an inherent value to identify the information appliance such that a user's operational burden can be reduced by using a TV monitor, a cellular telephone, etc. as a user interface.