A communication method, applied to a communications system comprising a network device, a first terminal device, and at least one second terminal device, wherein the network device communicates with the first terminal device by using a first communication link, the first terminal device communicates with the at least one second terminal device by using at least one second communication link, and the at least one second terminal device is in a one-to-one correspondence with the at least one second communication link, and the method comprises: receiving, by the network device, a measurement report sent by the first terminal device, wherein the measurement report comprises at least one piece of measurement data; and sending, by the network device to the first terminal device, indication information of a communication link change policy determined based on the at least one piece of measurement data, wherein the indication information is used to instruct the first terminal device to perform change processing on a communication link based on the communication link change policy, and the communication link comprises the first communication link and/or the second communication link, the communication method characterised in that before the receiving, by the network device, a measurement report sent by the first terminal device, the method further comprises: sending, by the network device, first measurement configuration information to the first terminal device, wherein the first measurement configuration information comprises a device-to-device, D2D carrier frequency used by the at least one second communication link, and the D2D carrier frequency comprises at least one of the following: a carrier frequency for D2D communication based on a Long Term Evolution, LTE system, a carrier frequency for D2D communication based on a wireless local area network, WLAN, and a carrier frequency for D2D communication based on Bluetooth. receiving, by the network device, a measurement report sent by the first terminal device, wherein the measurement report comprises at least one piece of measurement data; and sending, by the network device to the first terminal device, indication information of a communication link change policy determined based on the at least one piece of measurement data, wherein the indication information is used to instruct the first terminal device to perform change processing on a communication link based on the communication link change policy, and the communication link comprises the first communication link and/or the second communication link, the communication method characterised in that before the receiving, by the network device, a measurement report sent by the first terminal device, the method further comprises: sending, by the network device, first measurement configuration information to the first terminal device, wherein the first measurement configuration information comprises a device-to-device, D2D carrier frequency used by the at least one second communication link, and the D2D carrier frequency comprises at least one of the following: a carrier frequency for D2D communication based on a Long Term Evolution, LTE system, a carrier frequency for D2D communication based on a wireless local area network, WLAN, and a carrier frequency for D2D communication based on Bluetooth.