In a mobile communication system, an interference equalization method is installed in a radio base station for managing a cell configured of sectors, thus equalizing interference between sectors in uplink communication and improving sector-user throughputs. In the situation that congestion occurs in a second sector adjacent to a first sector, a handover from the second sector to the first sector is accelerated when uplink interference of the first sector is equal to or above a first threshold while the usage rate of resource blocks in the first sector is equal to or below a second threshold. This accelerates a handover from the second sector undergoing congestion to the first sector having available resource blocks, thus equalizing uplink interference between these sectors.