A system and associated method for retrieving information from the Internet by an end user through use of an Intelligent Search Agent. Further, the power supply device includes a buffer, a control section, a rectifier circuit, a smoothing circuit, and a switch. The superheated steam blown off from these steam blowoff openings 101 and 102 is effectively supplied to upper-and-back surface of a heating object 90 rested in the cooking chamber 20 so as to be spaced from the bottom face of the cooking chamber 20. The friction clutch is a wet clutch.