A method performed by a base station control apparatus for controlling a base station (220, 230) in a mobile communication system including a plurality of heterogeneous networks of different generations, the plurality of heterogeneous networks comprising an existing network and a next-generation network, the method comprising: receiving, by the base station control apparatus from a terminal, a network connection establishment message including information on utilization of a first network, wherein said first network is the next-generation network, and wherein the information on utilization of the first network indicates whether the terminal is capable of supporting the next-generation network; deciding, by the base station control apparatus, whether to approve or disapprove utilization of the first network by the terminal by using previously stored information on the terminal and the information on utilization of the first network; determining, by the base station control apparatus, the maximum data transfer rate for each of the next-generation network and the existing network; selecting, by the base station control apparatus, a gateway between a first gateway capable of supporting the first network, and a second gateway capable of supporting a second network, depending on whether the utilization of the first network is determined to be approved or disapproved, wherein the second network is the existing network, wherein the selecting comprises: - selecting the first gateway when the deciding approves the utilization of the first network by the terminal, by taking account of whether the gateway is a gateway capable of supporting the maximum data transfer rate for the first network as determined by the determining; and - selecting the second gateway when the deciding disapproves utilization of the first network by the terminal; and transmitting, by the base station control apparatus, a network connection establishment request message to the selected gateway after incorporating in the network connection establishment request message, the information on the utilization of the first network, the maximum data transfer rate for the first network, and the maximum data transfer rate for the second network. receiving, by the base station control apparatus from a terminal, a network connection establishment message including information on utilization of a first network, wherein said first network is the next-generation network, and wherein the information on utilization of the first network indicates whether the terminal is capable of supporting the next-generation network; deciding, by the base station control apparatus, whether to approve or disapprove utilization of the first network by the terminal by using previously stored information on the terminal and the information on utilization of the first network; determining, by the base station control apparatus, the maximum data transfer rate for each of the next-generation network and the existing network; selecting, by the base station control apparatus, a gateway between a first gateway capable of supporting the first network, and a second gateway capable of supporting a second network, depending on whether the utilization of the first network is determined to be approved or disapproved, wherein the second network is the existing network, wherein the selecting comprises: - selecting the first gateway when the deciding approves the utilization of the first network by the terminal, by taking account of whether the gateway is a gateway capable of supporting the maximum data transfer rate for the first network as determined by the determining; and - selecting the second gateway when the deciding disapproves utilization of the first network by the terminal; and - selecting the first gateway when the deciding approves the utilization of the first network by the terminal, by taking account of whether the gateway is a gateway capable of supporting the maximum data transfer rate for the first network as determined by the determining; and - selecting the second gateway when the deciding disapproves utilization of the first network by the terminal; and transmitting, by the base station control apparatus, a network connection establishment request message to the selected gateway after incorporating in the network connection establishment request message, the information on the utilization of the first network, the maximum data transfer rate for the first network, and the maximum data transfer rate for the second network.