A content transmission method includes obtaining, by a first terminal device, a first instruction instructing the first terminal device to perform content transmission with a second terminal device sending, by the first terminal device, to the second terminal device, and in response to the first instruction, first information instructing the second terminal device to determine that that the first terminal device transmits content to the second terminal device. Receiving, by the first terminal device, content transmission direction indication information from the second terminal device, determining, by the first terminal device, first content, and sending, by the first terminal device, the first content to the second terminal device to display the first content.