Provided is a communication device capable of satisfying a QoS requirement only with a simple configuration while allowing coexistence of a plurality of communication systems of different communication methods on the same communication medium and accurately setting a medium occupation ratio. A coexisting signal cycle T (209) is divided into M periods by a communication slot unit (207) formed by Ncommunication slots. Moreover, at least one communication slot in the communication slot unit (207) is defined as 'D-Slot' capable of acquiring a communication right M/X times in the coexisting signal cycle T (209) and a communication slot other than the D-Slot in the communication slot unit (207) is defined as 'S-Slot' which can acquire the communication right M times in the coexisting signal cycle T (209). The communication band occupied/used by the local communication system is allocated on the 1/X unit of the communication slot D-Slot and 1 unit of the communication slot S-Slot.