A cell configuration can be easily and dynamically changed with less equipment correspondingly to a communication environment by a dynamic cell reconfiguring method in a cellular network system including an antenna that has a plurality of sector antennas disposed correspondingly to a cell and a plurality of base station equipment disposed at a location distant from the antenna. Based on a predetermined parameter value output from the plurality of the sector antennas, a configuration of the cell is changed by switching connection between the plurality of the base station equipment and the plurality of the sector antennas.