A portable terminal includes an audio output unit configured to output audio signals to a plurality of external headphones; an event occurrence detection unit configured to detect occurrence of a predetermined event; and a control unit configured to, when the event occurrence detection unit detects the occurrence of the predetermined event while the audio output unit is outputting the audio signals to the plurality of external headphones, control the audio output unit to at least reduce the volume of an audio signal output to a particular external headphone specified in advance from among the plurality of external headphones to which the audio signals are output.