An apparatus for charging a wearable electronic device includes a first power terminal and a second power terminal to which predetermined voltage values are applied, respectively and a first ground terminal and a second ground terminal. The first power terminal and the first ground terminal are arranged in a first direction with respect to a first axis. 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. The wearable electronic device is charged through the first power terminal and the first ground terminal when the wearable electronic device is placed on the apparatus in the first direction. The wearable electronic device is charged through the second power terminal and the second ground terminal when the wearable electronic device is placed on the apparatus in the second direction.