This application provides a communication method and a communications apparatus. The method includes: receiving, by a first terminal device, communication quality reference information of a Uu interface from a network device; and determining, by the first terminal device based on the communication quality reference information of the Uu interface and communication quality information of a PC5 interface, a communication mode used to send target data to a second terminal device, where the communication mode is any one of the following: a Uu interface communication mode, a PC5 interface communication mode, or a multipath communication mode, the PC5 interface is an interface for direct communication between the first terminal device and the second terminal device, and communications interfaces in the multipath communication mode include the PC5 interface and the Uu interface. According to this application, a terminal device can be enabled to more accurately determine a communications interface or a communication mode for transmitting data, to improve data transmission performance.