A resource determining method, comprising: receiving a downlink data channel; determining a first uplink control channel resource from K uplink control channel resources based on an index of the last time-domain symbol occupied by the downlink data channel, a first time, and an offset indicated by a hybrid automatic repeat request feedback timing indicator field for the downlink data channel, wherein K is a positive integer; and sending acknowledgment information to a network device on the first uplink control channel resource, wherein the acknowledgment information is used to indicate whether the downlink data channel is correctly received, wherein the determining a first uplink control channel resource from K uplink control channel resources based on an index of the last time-domain symbol occupied by the downlink data channel, a first time, and an offset indicated by a hybrid automatic repeat request feedback timing indicator field for the downlink data channel comprises: determining L uplink control channel resources from the K uplink control channel resources based on the index of the last time-domain symbol occupied by the downlink data channel, the first time, and the offset indicated by the hybrid automatic repeat request feedback timing indicator field for the downlink data channel, wherein L is a positive integer, and L is less than or equal to K; and determining the first uplink control channel resource from the L uplink control channel resources, wherein the L uplink control channel resources are located in a first time unit, and an index of the first time unit is determined based on an index of a second time unit in which a second time-domain symbol is located and the offset indicated by the hybrid automatic repeat request feedback timing indicator field for the downlink data channel; and an index of the second time-domain symbol is determined based on the first time and the index of the last time-domain symbol occupied by the downlink data channel. receiving a downlink data channel; determining a first uplink control channel resource from K uplink control channel resources based on an index of the last time-domain symbol occupied by the downlink data channel, a first time, and an offset indicated by a hybrid automatic repeat request feedback timing indicator field for the downlink data channel, wherein K is a positive integer; and sending acknowledgment information to a network device on the first uplink control channel resource, wherein the acknowledgment information is used to indicate whether the downlink data channel is correctly received, wherein the determining a first uplink control channel resource from K uplink control channel resources based on an index of the last time-domain symbol occupied by the downlink data channel, a first time, and an offset indicated by a hybrid automatic repeat request feedback timing indicator field for the downlink data channel comprises: determining L uplink control channel resources from the K uplink control channel resources based on the index of the last time-domain symbol occupied by the downlink data channel, the first time, and the offset indicated by the hybrid automatic repeat request feedback timing indicator field for the downlink data channel, wherein L is a positive integer, and L is less than or equal to K; and determining the first uplink control channel resource from the L uplink control channel resources, wherein the L uplink control channel resources are located in a first time unit, and an index of the first time unit is determined based on an index of a second time unit in which a second time-domain symbol is located and the offset indicated by the hybrid automatic repeat request feedback timing indicator field for the downlink data channel; and an index of the second time-domain symbol is determined based on the first time and the index of the last time-domain symbol occupied by the downlink data channel. determining L uplink control channel resources from the K uplink control channel resources based on the index of the last time-domain symbol occupied by the downlink data channel, the first time, and the offset indicated by the hybrid automatic repeat request feedback timing indicator field for the downlink data channel, wherein L is a positive integer, and L is less than or equal to K; and determining the first uplink control channel resource from the L uplink control channel resources, wherein the L uplink control channel resources are located in a first time unit, and an index of the first time unit is determined based on an index of a second time unit in which a second time-domain symbol is located and the offset indicated by the hybrid automatic repeat request feedback timing indicator field for the downlink data channel; and an index of the second time-domain symbol is determined based on the first time and the index of the last time-domain symbol occupied by the downlink data channel.