A communication control system, comprising: a secondary usage node providing a secondary communication service and that is adapted to operate secondary systems on a frequency channel allocated to a primary system; a communication control apparatus and a detection node; the communication control apparatus (CM; 30b) comprising: a parameter acquisition unit that is adapted to acquire parameters to calculate coverage of secondary systems from the secondary usage node providing the secondary communication service and operating the secondary systems on the frequency channel allocated to the primary system; a calculation unit that is adapted to calculate the coverage of the secondary systems using the parameters acquired by the parameter acquisition unit; and an interference control unit that is adapted to notify the detection node (CDIS, 30a) adapted to detect neighboring secondary systems of the secondary systems, of coverage information representing the coverage of the secondary systems calculated by the calculation unit, wherein the coverage information is information indicating a reference position and a radius of the coverage or map information indicating whether each of a plurality of geographical blocks belongs to the coverage; the detection node (CDIS, 30a) comprising: a storage unit adapted to store the coverage information notified from the communication control apparatus; a communication unit adapted to receive the coverage information from the communication control apparatus, and a neighbor detection unit adapted to determine the possibility of interference between a plurality of secondary systems when the coverage information is notified from the communication control apparatus. a secondary usage node providing a secondary communication service and that is adapted to operate secondary systems on a frequency channel allocated to a primary system; a communication control apparatus and a detection node; the communication control apparatus (CM; 30b) comprising: a parameter acquisition unit that is adapted to acquire parameters to calculate coverage of secondary systems from the secondary usage node providing the secondary communication service and operating the secondary systems on the frequency channel allocated to the primary system; a calculation unit that is adapted to calculate the coverage of the secondary systems using the parameters acquired by the parameter acquisition unit; and an interference control unit that is adapted to notify the detection node (CDIS, 30a) adapted to detect neighboring secondary systems of the secondary systems, of coverage information representing the coverage of the secondary systems calculated by the calculation unit, wherein the coverage information is information indicating a reference position and a radius of the coverage or map information indicating whether each of a plurality of geographical blocks belongs to the coverage; the detection node (CDIS, 30a) comprising: a storage unit adapted to store the coverage information notified from the communication control apparatus; a communication unit adapted to receive the coverage information from the communication control apparatus, and a neighbor detection unit adapted to determine the possibility of interference between a plurality of secondary systems when the coverage information is notified from the communication control apparatus. a parameter acquisition unit that is adapted to acquire parameters to calculate coverage of secondary systems from the secondary usage node providing the secondary communication service and operating the secondary systems on the frequency channel allocated to the primary system; a calculation unit that is adapted to calculate the coverage of the secondary systems using the parameters acquired by the parameter acquisition unit; and an interference control unit that is adapted to notify the detection node (CDIS, 30a) adapted to detect neighboring secondary systems of the secondary systems, of coverage information representing the coverage of the secondary systems calculated by the calculation unit, wherein the coverage information is information indicating a reference position and a radius of the coverage or map information indicating whether each of a plurality of geographical blocks belongs to the coverage; the detection node (CDIS, 30a) comprising: a storage unit adapted to store the coverage information notified from the communication control apparatus; a communication unit adapted to receive the coverage information from the communication control apparatus, and a neighbor detection unit adapted to determine the possibility of interference between a plurality of secondary systems when the coverage information is notified from the communication control apparatus. a storage unit adapted to store the coverage information notified from the communication control apparatus; a communication unit adapted to receive the coverage information from the communication control apparatus, and a neighbor detection unit adapted to determine the possibility of interference between a plurality of secondary systems when the coverage information is notified from the communication control apparatus.