An apparatus to control power of an electronic device includes a local area network (LAN) controller to control network communication of the electronic device, a communication interface connected to an external dongle to perform the network communication, a connection detector to detect whether a first signal for connection with the LAN controller is received from the external dongle, and a power controller to supply power to the LAN controller when the first signal is detected and to shut off power to the LAN controller when the first signal is not detected.