There is provided an invention whose object is to efficiently perform exchange of control information, for example, in the case where a plurality of cells cooperate to moderate inter-cell interference, like the IA technology.There is provided a communication system in which there is a plurality of communication areas in which a base station apparatus and at least one terminal apparatus perform wireless communication, and the plurality of communication areas are adjacent to or overlap one another, wherein, in each communication area, in a case of performing cooperative control that performs communication while taking into consideration communication conditions in at least one another communication area, a base station apparatus in one communication area among the plurality of communication areas notifies a base station apparatus in another communication area of information for starting the cooperative control.