Based on home appliance information, network communication device identification information, and usage condition information of a home electric appliance, the server selects software for the network communication device corresponding to a home electric appliance from among a multiple pieces of software having a one-to-one relation with different types of a plurality of home electric appliances stored in a server storage unit, and transmits the software to the network communication device, the home appliance information being information with which the home electric appliance is identifiable, the network communication device identification information being information with which the network communication device is uniquely identifiable, the usage condition information being information on a usage environment and a usage function of the home electric appliance. The network communication device updates the software for the network communication device stored in the network communication device with the software transmitted from the server.