When an appliance is connected to the home network, appliance information is transmitted to a display terminal from the appliance. The display terminal transmits the received appliance information to a management server and requests the management server to transmit appliance icon information of the appliance. The management server extracts icon information conforming to the received appliance information from an icon database and sends the icon information to the display terminal. The display terminal generates an appliance icon image from the acquired icon information and superimposes and displays the appliance icon image on a floor plan image of a house. When a user moves the appliance icon to an installation location on a display screen, a room No. of a moving destination and an installation position in the room are detected. The detected positional information is sent to the management server and registered in association with the appliance.