To provide a stereo headphone driving method and device for driving a stereo headphone connected to a stereo jack having a pair of signal terminal and a common terminal with a low frequency signal, beep tone or the like in audio signals of left and right channels.

Audio signals 10 and 11 of left and right channels are amplified by amplifiers 15 and 16 to a predetermined amplitude and supplied to a pair of signal terminals 21 and 22 of a stereo jack 20. A monaural signal 12 is amplified by a monaural signal amplifier 30 and supplied to a common terminal 23 of the stereo jack 20. The monaural signal may be a low frequency component in audio signals of the left and right channels, beep tone, monaural speech signal or the like received from a controller 53.