A feedback method performed by a terminal device (130, 140), wherein the method comprises: receiving configuration information sent by a network device (110, 120), wherein the configuration information is used to indicate K time sequence relationships, the K time sequence relationships are respectively used for hybrid automatic repeat request, HARQ, feedback on K downlink frequency domain resources, the K downlink frequency domain resources are configured by the network device (110, 120) for the terminal device (130, 140), and K is a positive integer greater than or equal to 2; and sending HARQ feedback information to the network device (110, 120), wherein each one of the K time sequence relationships includes a time sequence relationship between a time unit used by the terminal device to receive a physical downlink control channel and a time unit used to send the HARQ feedback information, wherein the HARQ feedback information corresponds to a physical downlink shared channel scheduled by a physical downlink control channel and a quantity of downlink control channel monitoring occasions corresponding to the HARQ feedback information is determined based on the K time sequence relationships, wherein each one of the downlink control channel monitoring occasions is a physical downlink control channel monitoring occasion, wherein the quantity of downlink control channel monitoring occasions corresponding to the HARQ feedback information is determined based on a quantity of parameters obtained by finding a union of K parameter sets corresponding to the K time sequence relationships, wherein the quantity of downlink control channel monitoring occasions is further determined based on a largest subcarrier spacing in subcarrier spacings corresponding to the K downlink frequency domain resources, and a subcarrier spacing of an uplink frequency domain resource on which the HARQ feedback information is located. receiving configuration information sent by a network device (110, 120), wherein the configuration information is used to indicate K time sequence relationships, the K time sequence relationships are respectively used for hybrid automatic repeat request, HARQ, feedback on K downlink frequency domain resources, the K downlink frequency domain resources are configured by the network device (110, 120) for the terminal device (130, 140), and K is a positive integer greater than or equal to 2; and sending HARQ feedback information to the network device (110, 120), wherein each one of the K time sequence relationships includes a time sequence relationship between a time unit used by the terminal device to receive a physical downlink control channel and a time unit used to send the HARQ feedback information, wherein the HARQ feedback information corresponds to a physical downlink shared channel scheduled by a physical downlink control channel and a quantity of downlink control channel monitoring occasions corresponding to the HARQ feedback information is determined based on the K time sequence relationships, wherein each one of the downlink control channel monitoring occasions is a physical downlink control channel monitoring occasion, wherein the quantity of downlink control channel monitoring occasions corresponding to the HARQ feedback information is determined based on a quantity of parameters obtained by finding a union of K parameter sets corresponding to the K time sequence relationships, wherein the quantity of downlink control channel monitoring occasions is further determined based on a largest subcarrier spacing in subcarrier spacings corresponding to the K downlink frequency domain resources, and a subcarrier spacing of an uplink frequency domain resource on which the HARQ feedback information is located.