The invention provides a portable electronic device, which comprises an input unit, a media display processing unit, a mobile communication processing unit, a primary control unit, a timing unit and a power supply management unit. When the media display processing unit is in a waiting state and the input unit generates an incoming call answering command, the primary control unit judges whether a hangup command from the input unit is received during a preset time period or not; when the hangup command is not received, the primary control unit controls the media display processing unit to stop the work of the media display processing unit, and the power supply management unit controls the media display processing unit to decrease the voltage of the media display processing unit to a zero voltage from the voltage of the media display processing unit in the waiting state; and when the hangup command is received, the primary control unit controls the media display processing unit to switch the media display processing unit from the waiting state to a displaying state. The portable electronic device of the invention guarantees a user to continuously enjoy media information when the portable electronic device receives a call when displaying the media information and greatly reduces the energy consumption.