A first communications device, wherein the first communications device being a first terminal device comprises a processing module and a transceiver module; the processing module is configured to determine a capability identifier of the first communications device, wherein the capability identifier of the first communications device is one of one or more capability identifiers corresponding to the first communications device; and the transceiver module is configured to send the capability identifier of the first communications device to a second communications device, wherein the capability identifier of the first communications device is used to determine a communication capability of the first communications device; wherein the processing module is specifically configured to: when the first communications device supports reporting the capability identifier of the first communications device, determine the capability identifier of the first communications device and send the capability identifier to the second communications device, and wherein when the first communications device does not support reporting the capability identifier of the first communications device, the first communications device is configured to send indication information to the second communications device, wherein the indication information is used to indicate that the first communications device does not support reporting the capability identifier of the first communications device. the processing module is configured to determine a capability identifier of the first communications device, wherein the capability identifier of the first communications device is one of one or more capability identifiers corresponding to the first communications device; and the transceiver module is configured to send the capability identifier of the first communications device to a second communications device, wherein the capability identifier of the first communications device is used to determine a communication capability of the first communications device; wherein the processing module is specifically configured to: when the first communications device supports reporting the capability identifier of the first communications device, determine the capability identifier of the first communications device and send the capability identifier to the second communications device, and wherein when the first communications device does not support reporting the capability identifier of the first communications device, the first communications device is configured to send indication information to the second communications device, wherein the indication information is used to indicate that the first communications device does not support reporting the capability identifier of the first communications device. when the first communications device supports reporting the capability identifier of the first communications device, determine the capability identifier of the first communications device and send the capability identifier to the second communications device, and wherein when the first communications device does not support reporting the capability identifier of the first communications device, the first communications device is configured to send indication information to the second communications device, wherein the indication information is used to indicate that the first communications device does not support reporting the capability identifier of the first communications device.