To make a careless activation impossible to be performed by making a user present at all the time when starting cooking by disabling a remote control facility to activate or to inactivate a main function.

A user interface holds the activation and inactivation of the main function of the household equipment, which has a main household function but is suited to mutual operation with a communication network or interchange secondary function, and the remote control facility is disabled to activate or to inactivate that main function. The main function is cooking, thawing or freezing. As far as a user, all the operation of the communication module is performed through a touch screen or under infrared remote control. A microwave oven itself can be controlled through the communication module but remote control does not have an ability for switching the microwave oven to a cooking mode for the purpose of maintenance and this ability is secured by the touch screen.