A second radio base station (1B) receives, from a first radio base station (1A), both interference information for each of a plurality of resource blocks and a traffic amount ratio. Then, the second radio base station (1B) corrects, based on the received traffic amount ratio, the also received interference information for each resource block. Further, the second radio base station (1B) controls, based on the interference information as corrected for each resource block, the transmission power of a radio terminal (2B).