The embodiments of the present disclosure relate to a condition-based secondary node or primary secondary cell change method. The method includes: receiving configuration information for changing a secondary node/primary secondary cell; and changing the secondary node/primary secondary cell based on the configuration information for changing the secondary node/primary secondary cell. The configuration information for changing the secondary node/primary secondary cell includes at least one of: addition condition configuration information for a candidate secondary node/primary secondary cell; configuration information for the candidate secondary node/primary secondary cell; and release condition configuration information for a source secondary node/primary secondary cell. The embodiments of the present disclosure can implement condition-based addition of a secondary node or change of a primary secondary cell.