A service indication method, used in a communications system, wherein the communications system comprises a base station (01, 800, 900) and a terminal (02, 1000, 1100), the terminal supports a first frequency channel number and a second frequency channel number, a physical frequency of the first frequency channel number is the same as a physical frequency of the second frequency channel number, wherein the terminal supports carrier aggregation, CA, and the base station considers a CA band combination capability that is reported by the terminal, and the method comprises: sending, by the base station, first service indication information to the terminal, wherein the first service indication information comprises an identifier of the first frequency channel number and an identifier of a first service associated with the first frequency channel number; determining, by the base station, a second service associated with the second frequency channel number; and sending, by the base station, second service indication information to the terminal, wherein the second service indication information comprises the identifier of the first frequency channel number and an identifier of the second service; wherein the first frequency channel number is a primary frequency channel number, and the second frequency channel number is a secondary frequency channel number; and after the sending, by the base station, second service indication information to the terminal, the method further comprises: sending, by the base station, a deletion instruction to the terminal, wherein the deletion instruction is used to instruct the terminal to delete the first service indication information and the second service indication information; determining, by the base station, a third service associated with the second frequency channel number; and sending, by the base station, third service indication information to the terminal, wherein the third service indication information comprises an identifier of the second frequency channel number and an identifier of the third service. sending, by the base station, first service indication information to the terminal, wherein the first service indication information comprises an identifier of the first frequency channel number and an identifier of a first service associated with the first frequency channel number; determining, by the base station, a second service associated with the second frequency channel number; and sending, by the base station, second service indication information to the terminal, wherein the second service indication information comprises the identifier of the first frequency channel number and an identifier of the second service; wherein the first frequency channel number is a primary frequency channel number, and the second frequency channel number is a secondary frequency channel number; and after the sending, by the base station, second service indication information to the terminal, the method further comprises: sending, by the base station, a deletion instruction to the terminal, wherein the deletion instruction is used to instruct the terminal to delete the first service indication information and the second service indication information; determining, by the base station, a third service associated with the second frequency channel number; and sending, by the base station, third service indication information to the terminal, wherein the third service indication information comprises an identifier of the second frequency channel number and an identifier of the third service. sending, by the base station, a deletion instruction to the terminal, wherein the deletion instruction is used to instruct the terminal to delete the first service indication information and the second service indication information; determining, by the base station, a third service associated with the second frequency channel number; and sending, by the base station, third service indication information to the terminal, wherein the third service indication information comprises an identifier of the second frequency channel number and an identifier of the third service.