Terminal device, method, and integrated circuit

A first terminal device capable of side link communication according to the present invention receives a first message from a second terminal device, specifies information on the basis of a reference signal received power (RSRP) of the first message received by the second terminal device, and transmits a second message including the information to a third terminal device. The first message and the second message are messages for selecting a terminal device that functions as a sidelink transmission for transmitting the second terminal device to the third terminal device. 本发明的能进行侧链路通信的第一终端装置由第二终端装置接收第一消息，基于由所述第二终端装置接收到的所述第一消息的参照信号接收功率(RSRP：Reference Signal Received Power)来确定信息，对第三终端装置发送包括所述信息的第二消息，所述第一消息和所述第二消息是用于选择终端装置的消息，该终端装置起到对所述第三终端装置传输所述第二终端装置的侧链路发送的作用。