Without introducing a complicated ad hoc network system, a transmission/reception signal of a mobile station apparatus is relayed using a communication protocol and a wireless access method defined in a current LTE standard. In a wireless relay communication system including a base station apparatus (12a), a mobile station apparatus (10a), and a wireless station apparatus (11a), the wireless station apparatus (11a) receives a mode switching control signal to switching a mode either to a mobile station apparatus mode in which the wireless station apparatus communicates as one mobile station apparatus (10a) with the base station apparatus (12a) or to a relay station apparatus mode in which the wireless station apparatus relays communication between the base station apparatus (12a) and the mobile station apparatus (10a). In a case where it is instructed via the mode switching control signal to switch the mode to the mobile station apparatus mode, the wireless station apparatus performs communication with the base station apparatus (12a) on behalf of one mobile station apparatus (10a). In a case where an instruction is made by the mode switching control signal to switch to the relay station apparatus mode, the wireless station apparatus relays communication between the base station apparatus (12a) and the mobile station apparatus (10a).