Communication system, wireless terminal, and wireless communication method

The purpose of the present invention is to provide a communication system, a wireless terminal, and a wireless communication method capable of suppressing power consumption of the wireless terminal without lowering transmission efficiency. The present invention comprises: a plurality of wireless terminals that transmit a packet including each acquired information signal by a first wireless communication method; and a relay device that receives packets transmitted from the wireless terminals and transmits the received packets by a second wireless communication method, each of the wireless terminals including: a first wireless communication circuit that performs wireless communication by a first wireless communication method; a second wireless communication circuit that performs wireless communication by a second wireless communication method; and a control unit that determines whether or not the wireless channel of the second wireless communication system is in use, and if it is determined that the wireless ch