A method, an apparatus, and a system are disclosed, which can reduce power consumption of an electronic device by allowing a communication relay device, to which the electronic device is connected, to perform an operation of the electronic device corresponding to waking up from a sleep mode according to a system timer cycle to identify paging and performing channel monitoring on behalf of the electronic device. A method of reducing power consumption of an electronic device may include: making a connection between the electronic device and a communication relay device; transmitting forwarding information to the communication relay device in response to the connection with the communication relay device by the electronic device; notifying of entry into a sleep mode to the communication relay device and entering the sleep mode by the electronic device; performing channel monitoring for the electronic device in response to the notification of the entry of the electronic device into the sleep mode by the communication relay device; waking up the electronic device when detecting paging corresponding to the electronic device by the communication relay device; and processing the paging in response to the waking-up of the communication relay device by the electronic device.