Method for receiving acknowledgement or negative acknowledgement, ACK/NACK, indication information, wherein the method comprises: configuring, by a network-side device, a plurality of carriers for a user equipment, UE, wherein the carriers comprise a primary carrier and at least one secondary carrier; transmitting via the primary carrier or the at least one secondary carrier, by the network-side device, physical downlink control channel, PDCCH, information to the UE in a first downlink subframe, wherein the PDCCH information indicates scheduling information of a physical downlink shared channel, PDSCH, carried in a second downlink subframe of the primary or the at least one secondary carrier; selecting, by the network-side device, one of a plurality of timing relationships between the second downlink subframe carrying the PDSCH and an uplink subframe carrying an ACK/NACK corresponding to the PDSCH, as a selected timing relationship, determining the uplink subframe corresponding to the selected timing relationship and used by the UE to transmit the ACK/NACK corresponding to the PDSCH; and determining a carrier out of the primary carrier and the at least one secondary carrier used by the UE to transmit the ACK/NACK corresponding to the PDSCH as selected carrier, wherein the selected timing relationship meets a condition, and the condition is that a subframe on the selected carrier of the same time as the second downlink subframe is also a downlink subframe, thereby ensuring that the determined uplink subframe is a subframe that can be used by the UE to transmit the ACK/NACK; indicating, by the network-side device, related information corresponding to the determined uplink subframe and the selected carrier to the UE; determining, by the network-side device, a channel resource used by the UE to feed back the ACK/NACK corresponding to the PDSCH in the uplink subframe of the selected carrier, and indicating the channel resource to the UE; and receiving, by the network-side device, the ACK/NACK fed back by the UE on the channel resource in the uplink subframe of the selected carrier. configuring, by a network-side device, a plurality of carriers for a user equipment, UE, wherein the carriers comprise a primary carrier and at least one secondary carrier; transmitting via the primary carrier or the at least one secondary carrier, by the network-side device, physical downlink control channel, PDCCH, information to the UE in a first downlink subframe, wherein the PDCCH information indicates scheduling information of a physical downlink shared channel, PDSCH, carried in a second downlink subframe of the primary or the at least one secondary carrier; selecting, by the network-side device, one of a plurality of timing relationships between the second downlink subframe carrying the PDSCH and an uplink subframe carrying an ACK/NACK corresponding to the PDSCH, as a selected timing relationship, determining the uplink subframe corresponding to the selected timing relationship and used by the UE to transmit the ACK/NACK corresponding to the PDSCH; and determining a carrier out of the primary carrier and the at least one secondary carrier used by the UE to transmit the ACK/NACK corresponding to the PDSCH as selected carrier, wherein the selected timing relationship meets a condition, and the condition is that a subframe on the selected carrier of the same time as the second downlink subframe is also a downlink subframe, thereby ensuring that the determined uplink subframe is a subframe that can be used by the UE to transmit the ACK/NACK; indicating, by the network-side device, related information corresponding to the determined uplink subframe and the selected carrier to the UE; determining, by the network-side device, a channel resource used by the UE to feed back the ACK/NACK corresponding to the PDSCH in the uplink subframe of the selected carrier, and indicating the channel resource to the UE; and receiving, by the network-side device, the ACK/NACK fed back by the UE on the channel resource in the uplink subframe of the selected carrier.