The present invention provides a radio communication system that can decide efficiently a filter coefficient used when averaging a transmission power value. The radio communication system of the present invention includes an acquisition unit (1) acquiring at least a transmission power value which each base station (105) measured, and a decision unit (2) specifying a congestion transmission power value, at which a congestion arises, among from the transmission power value acquired by the acquisition unit (1), selecting a filter coefficient according to the congestion transmission power value, and deciding the selected filter coefficient as a new filter coefficient, and decides whether the congestion arose, on the basis of an electric power mean value averaged with the new filter coefficient decided by the decision unit (2).