A communication control device comprising: an obtaining unit configured to, in a radio communication system including a primary base station to which a primary terminal is connected, and a secondary base station to which a secondary terminal (40, 90) is connected by secondarily using a frequency channel for the primary base station, obtain a first quality report containing a first communication quality indicator measured by the primary terminal (20, 90) and a second quality report containing a second communication quality indicator measured by the secondary terminal (40, 90); and an interference control unit configured to instruct the secondary base station to reduce transmission power, when it is determined that adverse interference is present in the radio communication system, based on at least one of the first communication quality indicator or the second communication quality indicator, wherein the first communication quality indicator is based on measurement of quality of a first signal transmitted by and configured to report via the primary base station, wherein the second communication quality indicator is based on measurement of quality of a second signal transmitted by and configured to report via the secondary base station, wherein the secondary base station is located in a coverage of the primary base station, secondarily uses the frequency channel of the primary base station; wherein the primary terminal (20, 90) and the primary base station operate according to a frequency division duplex scheme, wherein the secondary terminal (40, 90) and the secondary base station secondarily use only uplink channels of the primary base station, and wherein, when interference power in the secondary base station caused by transmission power of the primary terminal (20, 90) does not satisfy allowable interference power on an assumption that the primary terminal is located at a cell edge of the secondary base station, the interference control unit determines that the adverse interference is present; wherein, when interference power in the primary base station caused by transmission power of the secondary terminal does not satisfy allowable interference power on an assumption that the secondary terminal (40, 90) is located at a cell edge of the secondary base station, the interference control unit determines that the adverse interference is present. an obtaining unit configured to, in a radio communication system including a primary base station to which a primary terminal is connected, and a secondary base station to which a secondary terminal (40, 90) is connected by secondarily using a frequency channel for the primary base station, obtain a first quality report containing a first communication quality indicator measured by the primary terminal (20, 90) and a second quality report containing a second communication quality indicator measured by the secondary terminal (40, 90); and an interference control unit configured to instruct the secondary base station to reduce transmission power, when it is determined that adverse interference is present in the radio communication system, based on at least one of the first communication quality indicator or the second communication quality indicator, wherein the first communication quality indicator is based on measurement of quality of a first signal transmitted by and configured to report via the primary base station, wherein the second communication quality indicator is based on measurement of quality of a second signal transmitted by and configured to report via the secondary base station, wherein the secondary base station is located in a coverage of the primary base station, secondarily uses the frequency channel of the primary base station; wherein the primary terminal (20, 90) and the primary base station operate according to a frequency division duplex scheme, wherein the secondary terminal (40, 90) and the secondary base station secondarily use only uplink channels of the primary base station, and wherein, when interference power in the secondary base station caused by transmission power of the primary terminal (20, 90) does not satisfy allowable interference power on an assumption that the primary terminal is located at a cell edge of the secondary base station, the interference control unit determines that the adverse interference is present; wherein, when interference power in the primary base station caused by transmission power of the secondary terminal does not satisfy allowable interference power on an assumption that the secondary terminal (40, 90) is located at a cell edge of the secondary base station, the interference control unit determines that the adverse interference is present.