case will be described that a product 1 the washing machine is operated and a product 2 the dryer is not operated once it is judged that the washing machine is required to be operated and the dryer is not the washing machine is supplied its optimal performance current value 61 that is since the micoms of the products 1 and 2 check the interaction of the products 1 and 2 and supply each optimal performance current of the two products the permanent current loss 31 and 41 shown in fig2 may not be created although the currents are supplied in that way the currents may not exceed the current limit 63 thereby possible to supply the currents safely and efficiently also auxiliary control means may be provided outside of the washing machine and the dryer as necessary the auxiliary control means gives the priority to the washing machine or the dryer and allows either of the two products 1 and 2 operated by its optimal performance current alternatively the priority may be set in advance in each micom of the products 1 and 2 alternatively an input button may be provided for a user to input the priority directly fig4 shows a case that the control means is provided by using a home network system the home network system is a system that controls and manages electric home appliances such as a washing machine a refrigerator a television a vcr an electric heater and a lightning unit in a building by using a communication unit such as a mobile phone and a public phone outside the building after connecting the electric home appliances with a cable or wirelessly the home network system requires a.