A method performed by a base station for indicating to use a spectrum, comprising: sending, in a primary cell, Pcell, a first wireless network identifier to user equipment, UE, wherein a carrier used in the Pcell is a carrier in a licensed spectrum; and sending, in a secondary cell, Scell, a second wireless network identifier that is the same as the first wireless network identifier to the UE, wherein a carrier used in the Scell is a carrier in a unlicensed spectrum, and the first wireless network identifier/the second wireless network identifier uniquely identifies one wireless network operator; when determining that feedback information that is returned by the UE and that comprises a signal measurement result for the Scell is not received, or when determining that feedback information that is returned by the UE and that indicates that a signal measurement result for the Scell is invalid is received, or when determining that feedback information that is returned by the UE and that instructs to change a cell identifier of the Scell is received, changing the cell identifier of the Scell; and when the feedback information that is returned by the UE and that comprises the signal measurement result for the Scell is received, performing resource configuration and data scheduling for the UE according to the signal measurement result for the Scell; and wherein the sending, in the Scell, the second wireless network identifier to the UE specifically comprises: sending, in the Scell, the second wireless network identifier to the UE by using a first downlink shared channel, wherein a transmission channel of scheduling information that corresponds to the first downlink shared channel is in first common search space of a control channel, and the first common search space of a control channel is common search space of the Pcell or common search space of the Scell; or sending, in the Scell, the second wireless network identifier to the UE by using a second downlink shared channel, wherein a resource that corresponds to the second downlink shared channel is a preset resource that corresponds to a cell identifier of the Scell; or sending, in the Scell to the UE by using a third downlink shared channel, the second wireless network identifier and a preset sequence that is used to identify the second wireless network identifier. sending, in a primary cell, Pcell, a first wireless network identifier to user equipment, UE, wherein a carrier used in the Pcell is a carrier in a licensed spectrum; and sending, in a secondary cell, Scell, a second wireless network identifier that is the same as the first wireless network identifier to the UE, wherein a carrier used in the Scell is a carrier in a unlicensed spectrum, and the first wireless network identifier/the second wireless network identifier uniquely identifies one wireless network operator; when determining that feedback information that is returned by the UE and that comprises a signal measurement result for the Scell is not received, or when determining that feedback information that is returned by the UE and that indicates that a signal measurement result for the Scell is invalid is received, or when determining that feedback information that is returned by the UE and that instructs to change a cell identifier of the Scell is received, changing the cell identifier of the Scell; and when the feedback information that is returned by the UE and that comprises the signal measurement result for the Scell is received, performing resource configuration and data scheduling for the UE according to the signal measurement result for the Scell; and wherein the sending, in the Scell, the second wireless network identifier to the UE specifically comprises: sending, in the Scell, the second wireless network identifier to the UE by using a first downlink shared channel, wherein a transmission channel of scheduling information that corresponds to the first downlink shared channel is in first common search space of a control channel, and the first common search space of a control channel is common search space of the Pcell or common search space of the Scell; or sending, in the Scell, the second wireless network identifier to the UE by using a second downlink shared channel, wherein a resource that corresponds to the second downlink shared channel is a preset resource that corresponds to a cell identifier of the Scell; or sending, in the Scell to the UE by using a third downlink shared channel, the second wireless network identifier and a preset sequence that is used to identify the second wireless network identifier. sending, in the Scell, the second wireless network identifier to the UE by using a first downlink shared channel, wherein a transmission channel of scheduling information that corresponds to the first downlink shared channel is in first common search space of a control channel, and the first common search space of a control channel is common search space of the Pcell or common search space of the Scell; or sending, in the Scell, the second wireless network identifier to the UE by using a second downlink shared channel, wherein a resource that corresponds to the second downlink shared channel is a preset resource that corresponds to a cell identifier of the Scell; or sending, in the Scell to the UE by using a third downlink shared channel, the second wireless network identifier and a preset sequence that is used to identify the second wireless network identifier.