A mobile communication terminal which senses a counterpart mobile communication terminal located within a predetermined range by using local area communication and displays a character corresponding to the sensed counterpart mobile communication terminal on its screen. The induction heating fusing device includes: a serial resonance circuit having an induction coil and a condenser; a phase comparator, a phase controller, a resonance frequency tracking oscillator, and a PWM signal generator. 1% at an ordinary temperature, and a damping factor of not lower than 0. The preferred anhydrous compounds are anhydrous or calcined MgSO4 and CaO.