A wireless communication system, comprising a base station and a mobile terminal; wherein the base station comprises: cell information acquisition means for acquiring cell information including cell quality information and cell identification information on a surrounding cell located around the base station; and transmission means for transmitting, to the mobile terminal, cell information on at least one surrounding cell for which the base station acquired associated cell information and an instruction for acquisition of cell information on a surrounding cell for which the base station does not have associated cell information; and wherein the mobile terminal comprises: reception means for receiving, from the base station, the cell information on the at least one surrounding cell for which the base station acquired associated cell information and the instruction for acquisition of cell information on a surrounding cell for which the base station does not have associated cell information; cell measurement means for measuring a surrounding cell located around the mobile terminal on the basis of the instruction for acquisition of cell information, and acquiring cell information on the surrounding cell; unknown cell detection means for comparing the acquired cell information on the surrounding cell located around the mobile terminal with the cell information received by the reception means, and detecting a surrounding cell for which the base station does not have associated cell information; and unknown cell information transmission means for transmitting, to the base station, the cell information on the surrounding cell for which the base station does not have associated cell information, detected by the unknown cell detection means. cell information acquisition means for acquiring cell information including cell quality information and cell identification information on a surrounding cell located around the base station; and transmission means for transmitting, to the mobile terminal, cell information on at least one surrounding cell for which the base station acquired associated cell information and an instruction for acquisition of cell information on a surrounding cell for which the base station does not have associated cell information; and reception means for receiving, from the base station, the cell information on the at least one surrounding cell for which the base station acquired associated cell information and the instruction for acquisition of cell information on a surrounding cell for which the base station does not have associated cell information; cell measurement means for measuring a surrounding cell located around the mobile terminal on the basis of the instruction for acquisition of cell information, and acquiring cell information on the surrounding cell; unknown cell detection means for comparing the acquired cell information on the surrounding cell located around the mobile terminal with the cell information received by the reception means, and detecting a surrounding cell for which the base station does not have associated cell information; and unknown cell information transmission means for transmitting, to the base station, the cell information on the surrounding cell for which the base station does not have associated cell information, detected by the unknown cell detection means.