1. A network server, comprising:a processor; and
a memory configured to store executable program codes, which, when executed, cause the processor to:
receive a network identity (ID) acquisition request from a first mobile communication terminal sent through a wireless local area network;
broadcast the network ID acquisition request in the local area network;
receive a public land mobile network (PLMN) network ID of a local operator from a second mobile communication terminal, the PLMN network ID of the local operator comprising a PLMN network ID of a local operator who has contracted with a home operator of the second mobile communication terminal; and
unicast the PLMN network ID of the local operator to the first mobile communication terminal, or broadcast the PLMN network ID of the local operator within the local area network.