obtaining, by a distributed unit (DU), resource occupation information of network slices that are in at least two public land mobile networks (PLMNs) supported by a cell of the DU, wherein the network slices in the at least two PLMNs share a resource;

sending, by the DU, the resource occupation information to a centralized unit (CU);

receiving, by the DU, request information from a terminal, wherein the request information comprises an identifier of a first PLMN and an identifier of a first network slice, and wherein the request information is used by the terminal to request to access the first network slice that is in the first PLMN;

sending, by the DU, the request information to the CU;

receiving, by the DU, release information from the CU, wherein the release information indicates to the terminal to release a radio resource control (RRC) connection to the CU; and

sending, by the DU, the release information to the terminal.