An apparatus for charging a wearable electronic device, the apparatus comprising: a power source unit; lla first power terminal and a second power terminal to which predetermined voltage values can be applied, respectively; a first ground terminal and a second ground terminal, wherein the first power terminal and the first ground terminal are arranged in a first direction with respect to a first axis (I-I'), wherein the second power terminal and the second ground terminal are arranged in a second direction opposite to the first direction with respect to the first axis, wherein the apparatus is configured to charge the wearable electronic device through the first power terminal and the first ground terminal when the wearable electronic device is placed on the apparatus in the first direction, and wherein the apparatus is configured to charge the wearable electronic device through the second power terminal and the second ground terminal when the wearable electronic device is placed on the apparatus in the second direction. characterized by further comprising: a first resistor; a first switch; and a control unit configured: - to sense whether the wearable device is connected in the first direction or in the second direction based on the current flowing through the first resistor, and - to selectively control, via the first switch, the connection of one of the first power terminal and the second power terminal to the power source unit, so that current can flow from the power source unit through the first resistor and the first switch to the first power terminal or the second power terminal, based on whether the first direction or the second direction is detected, respectively. lla first power terminal and a second power terminal to which predetermined voltage values can be applied, respectively; a first ground terminal and a second ground terminal, wherein the first power terminal and the first ground terminal are arranged in a first direction with respect to a first axis (I-I'), wherein the second power terminal and the second ground terminal are arranged in a second direction opposite to the first direction with respect to the first axis, wherein the apparatus is configured to charge the wearable electronic device through the first power terminal and the first ground terminal when the wearable electronic device is placed on the apparatus in the first direction, and wherein the apparatus is configured to charge the wearable electronic device through the second power terminal and the second ground terminal when the wearable electronic device is placed on the apparatus in the second direction. a first resistor; a first switch; and a control unit configured: - to sense whether the wearable device is connected in the first direction or in the second direction based on the current flowing through the first resistor, and - to selectively control, via the first switch, the connection of one of the first power terminal and the second power terminal to the power source unit, so that current can flow from the power source unit through the first resistor and the first switch to the first power terminal or the second power terminal, based on whether the first direction or the second direction is detected, respectively. - to sense whether the wearable device is connected in the first direction or in the second direction based on the current flowing through the first resistor, and - to selectively control, via the first switch, the connection of one of the first power terminal and the second power terminal to the power source unit, so that current can flow from the power source unit through the first resistor and the first switch to the first power terminal or the second power terminal, based on whether the first direction or the second direction is detected, respectively.