A frequency band basis for access of user equipment (UE) to a serving cell is determined. Configuration information for an inter-frequency neighbor cell, at a preset physical frequency point, of the frequency band basis for the access of the UE to the serving cell, and one or more carrier aggregation combinations supported by the UE are acquired. A target frequency band of a secondary carrier required to be configured by the UE is determined according to the configuration information for the inter-frequency neighbor cell and the one or more carrier aggregation combinations supported by the UE. A corresponding reconfiguration message is sent to the UE and an inter-frequency neighbor cell, at the preset physical frequency point, of the target frequency band is used as a secondary serving cell according to a carrier aggregation capability of the UE in the target frequency band.