A wireless communication system comprising: a first base station configured to communicate using a frequency within a licensed band; a plurality of second base stations configured to communicate using a frequency within an unlicensed band; and a communication terminal configured to simultaneously communicate with the first base station and any of the plurality of second base stations , wherein the communication terminal is further configured to detect first identification information broadcasted from the first base station , the first identification information indicating a first communication network to which the first base station belongs, generate a measurement report including a measurement result regarding one or more of the plurality of second base stations , transmit the measurement report to the first base station , detect second identification information broadcasted from a third base station selected by the first base station in accordance with the measurement report and being any of the plurality of second base stations , the second identification information indicating a second communication network to which the second base stations belong, and establish a connection with the third base station when the second identification information coincides with the first identification information. a first base station configured to communicate using a frequency within a licensed band; a plurality of second base stations configured to communicate using a frequency within an unlicensed band; and a communication terminal configured to simultaneously communicate with the first base station and any of the plurality of second base stations , wherein the communication terminal is further configured to detect first identification information broadcasted from the first base station , the first identification information indicating a first communication network to which the first base station belongs, generate a measurement report including a measurement result regarding one or more of the plurality of second base stations , transmit the measurement report to the first base station , detect second identification information broadcasted from a third base station selected by the first base station in accordance with the measurement report and being any of the plurality of second base stations , the second identification information indicating a second communication network to which the second base stations belong, and establish a connection with the third base station when the second identification information coincides with the first identification information. detect first identification information broadcasted from the first base station , the first identification information indicating a first communication network to which the first base station belongs, generate a measurement report including a measurement result regarding one or more of the plurality of second base stations , transmit the measurement report to the first base station , detect second identification information broadcasted from a third base station selected by the first base station in accordance with the measurement report and being any of the plurality of second base stations , the second identification information indicating a second communication network to which the second base stations belong, and establish a connection with the third base station when the second identification information coincides with the first identification information. <EOS>