In a communication system in which a plurality base station apparatuses are arranged such that the entirety or part of cells of the plurality of base station apparatuses overlaps with one another, a master base station apparatus calculates transmission weighting coefficients of the base station apparatuses and reception weighting coefficients of mobile station apparatuses such that directions of equivalent channels of interference signals received by the mobile station apparatuses connected to the base station apparatuses become orthogonal to the reception weighting coefficients by which the mobile station apparatuses multiply their respective reception signals. The base station apparatuses transmit the reception weighting coefficients to the mobile station apparatuses connected thereto, and the mobile station apparatuses perform a reception process by multiplying their respective reception signals including the interference signals by the reception weighting coefficients.