A method includes: sending, by a first terminal device, an HARQ-ACK to a network device based on received HARQ-ACK feedback indication information sent by the network device, where the HARQ-ACK feedback indication information is used to indicate a transmission time interval commonly occupied by at least one terminal device to feed back an HARQ-ACK and proprietary information about an HARQ-ACK fed back by each terminal device, and the at least one terminal device includes the first terminal device. In this technical solution, HARQ-ACK feedback indication information can indicate proprietary information about an HARQ-ACK fed back by a terminal device, thereby reducing a load of an uplink control channel when the terminal device feeds back the HARQ-ACK.