A fuel nozzle 110 having a plurality of swirl vane 130 on an outer peripheral surface thereof is installed within a burner tube 120, with a clearance 121 being provided. A method of manufacturing the buoy utilizes a processing line that molds elements of the buoy including the pocket. The SOFC also includes a ceramic support layer on the electrolyte. On the other hand, if the today is the registered occasion date, the first predetermined image is changed to a second predetermined image for the idle mode screen and the first predetermined ring sound is changed, to a second predetermined ring sound in place of the incoming call ring sound.