The disclosure relates to a method and an apparatus for providing a service by a first device with a main device in a wireless communication system. The disclosure provides a method and an apparatus in which: in a specific state, a first device transmits an advertising packet indicating a state of the first device to the main device, connects with the main device via Bluetooth LE, on the basis of the advertising packet, and then activates the main power in order to provide a specific service together with the main device, wherein the specific mode state indicates a state in which a low power wireless communication module for transmitting or receiving a packet of the Bluetooth LE has been activated and the main power has been deactivated, and the main power is activated when the first device recognizes activation of the main power of the main device.