According to one embodiment, a communication relaying apparatus directly or indirectly relays communication between a base transceiver station and a mobile communication terminal. The communication relaying apparatus includes a determiner and an interrupter. The determiner determines whether an uplink signal is received from the mobile communication terminal through a wireless communication antenna. The interrupter interrupts, when the determiner determines that the uplink signal is not received, a transmission path of the uplink signal to the base transceiver station side.