A method for transmitting feedback information, applicable to carrier aggregation with at least one Time Division Duplex, TDD, carrier and at least one Frequency Division Duplex, FDD, carrier, the method comprising: receiving, by a UE, configuration signaling transmitted by the network side, wherein the configuration signaling indicates information about grouping of M carriers aggregated in the carrier aggregation into N groups, wherein each group comprises at least one carrier among the M carriers, and the same duplex mode is applied to carriers belonging to a group; for each group, one carrier of the group is indicated for uplink transmission of feedback information by the configuration signaling; and M represents a positive integer, and N represents a positive integer no more than M; wherein at least one of the groups comprises more than one carrier among the M carriers; determining, by the UE, at least one carrier for transmitting feedback information corresponding to downlink data, according to the configuration signaling; and receiving, by the UE, the downlink data and transmitting the feedback information corresponding to the downlink data to the network side according to a result of determination; characterized in that determining the at least one carrier for transmitting the feedback information corresponding to the downlink data, according to the configuration signaling comprises: determining that the feedback information corresponding to all the downlink data transmitted in first category of groups is to be transmitted over a carrier C' in an uplink subframe n, wherein the first category consists of any group for which feedback information is to be transmitted in the uplink subframe n; and the carrier C' is a carrier configured for a group with the highest priority in the first category. receiving, by a UE, configuration signaling transmitted by the network side, wherein the configuration signaling indicates information about grouping of M carriers aggregated in the carrier aggregation into N groups, wherein each group comprises at least one carrier among the M carriers, and the same duplex mode is applied to carriers belonging to a group; for each group, one carrier of the group is indicated for uplink transmission of feedback information by the configuration signaling; and M represents a positive integer, and N represents a positive integer no more than M; wherein at least one of the groups comprises more than one carrier among the M carriers; determining, by the UE, at least one carrier for transmitting feedback information corresponding to downlink data, according to the configuration signaling; and receiving, by the UE, the downlink data and transmitting the feedback information corresponding to the downlink data to the network side according to a result of determination; characterized in that determining the at least one carrier for transmitting the feedback information corresponding to the downlink data, according to the configuration signaling comprises: determining that the feedback information corresponding to all the downlink data transmitted in first category of groups is to be transmitted over a carrier C' in an uplink subframe n, wherein the first category consists of any group for which feedback information is to be transmitted in the uplink subframe n; and the carrier C' is a carrier configured for a group with the highest priority in the first category. determining that the feedback information corresponding to all the downlink data transmitted in first category of groups is to be transmitted over a carrier C' in an uplink subframe n, wherein the first category consists of any group for which feedback information is to be transmitted in the uplink subframe n; and the carrier C' is a carrier configured for a group with the highest priority in the first category.