Energy saving switch device, and method thereof

An energy saving switch device (100) for an electronic apparatus (150), including: a power control unit (110), determining whether to provide an external power to the electronic apparatus according to an external control signal; a switch unit (120), coupled to the power control unit and the external power (140), and when receiving a power off signal, electrically disconnecting the external power from the electronic apparatus; and a detection unit (130), detecting whether a user is inside a predetermined range when the power control unit is not providing the external power to the electronic apparatus, and generating the power off signal when the user is not inside the predetermined range.