A carrier indication method, the method comprising: receiving, by user equipment, first information sent by a base station; if the user equipment is capable of transmitting uplink data and downlink data on a carrier in terms of using one carrier for downlink and uplink transmission, determining, by the user equipment according to the first information, a carrier used for transmitting first-type information; and transmitting, by the user equipment, the first-type information on the determined carrier, wherein the first-type information comprises at least one of the following: uplink data, downlink data, and scheduling information, wherein the determining, by the user equipment according to the first information, a carrier used for transmitting first-type information comprises: determining, by the user equipment according to a correspondence between the first information and the carrier for transmitting the first-type information, the carrier used for transmitting the first-type information; determining, by the user equipment, whether the first information belongs to a first predetermined set or a second predetermined set; and if the first information belongs to the first predetermined set, determining, by the user equipment, to transmit the first-type information on a first carrier; or if the first information belongs to the second predetermined set, determining, by the user equipment, to transmit the first-type information on a second carrier. receiving, by user equipment, first information sent by a base station; if the user equipment is capable of transmitting uplink data and downlink data on a carrier in terms of using one carrier for downlink and uplink transmission, determining, by the user equipment according to the first information, a carrier used for transmitting first-type information; and transmitting, by the user equipment, the first-type information on the determined carrier, wherein the first-type information comprises at least one of the following: uplink data, downlink data, and scheduling information, wherein the determining, by the user equipment according to the first information, a carrier used for transmitting first-type information comprises: determining, by the user equipment according to a correspondence between the first information and the carrier for transmitting the first-type information, the carrier used for transmitting the first-type information; determining, by the user equipment, whether the first information belongs to a first predetermined set or a second predetermined set; and if the first information belongs to the first predetermined set, determining, by the user equipment, to transmit the first-type information on a first carrier; or if the first information belongs to the second predetermined set, determining, by the user equipment, to transmit the first-type information on a second carrier. determining, by the user equipment according to a correspondence between the first information and the carrier for transmitting the first-type information, the carrier used for transmitting the first-type information; determining, by the user equipment, whether the first information belongs to a first predetermined set or a second predetermined set; and if the first information belongs to the first predetermined set, determining, by the user equipment, to transmit the first-type information on a first carrier; or if the first information belongs to the second predetermined set, determining, by the user equipment, to transmit the first-type information on a second carrier.