A wireless communication system in which a plurality of wireless base station devices comprising a first wireless base station device and a second wireless base station device perform a coordinated transmission process to a wireless terminal device, wherein: the first wireless base station device includes a transmission unit configured to transmit to the wireless terminal device a first control channel which includes information which indicates new data or retransmission data; and the wireless terminal device includes: a control channel reception unit configured to receive the first control channel transmitted from the first wireless base station device; a data reception unit (302, 303) configured to receive not only data transmitted from the first wireless base station device but also data coordinately transmitted from the second wireless base station device using a resource which is indicated by the first control channel received by the control channel reception unit; a control channel transmission unit configured to transmit a second control channel related to a retransmission of the data received by the data reception unit (302, 303) to at least the first wireless base station; and a reception control unit configured to control Hybrid Automatic Repeat reQuest (HARQ) process for data coordinately transmitted by at least the first wireless base station device and the second wireless base station device based on the first control channel, the information which indicates new data or retransmission data of the first control channel being generated corresponding to the second control channel transmitted by the control channel transmission unit. the first wireless base station device includes a transmission unit configured to transmit to the wireless terminal device a first control channel which includes information which indicates new data or retransmission data; and the wireless terminal device includes: a control channel reception unit configured to receive the first control channel transmitted from the first wireless base station device; a data reception unit (302, 303) configured to receive not only data transmitted from the first wireless base station device but also data coordinately transmitted from the second wireless base station device using a resource which is indicated by the first control channel received by the control channel reception unit; a control channel transmission unit configured to transmit a second control channel related to a retransmission of the data received by the data reception unit (302, 303) to at least the first wireless base station; and a reception control unit configured to control Hybrid Automatic Repeat reQuest (HARQ) process for data coordinately transmitted by at least the first wireless base station device and the second wireless base station device based on the first control channel, the information which indicates new data or retransmission data of the first control channel being generated corresponding to the second control channel transmitted by the control channel transmission unit. a control channel reception unit configured to receive the first control channel transmitted from the first wireless base station device; a data reception unit (302, 303) configured to receive not only data transmitted from the first wireless base station device but also data coordinately transmitted from the second wireless base station device using a resource which is indicated by the first control channel received by the control channel reception unit; a control channel transmission unit configured to transmit a second control channel related to a retransmission of the data received by the data reception unit (302, 303) to at least the first wireless base station; and a reception control unit configured to control Hybrid Automatic Repeat reQuest (HARQ) process for data coordinately transmitted by at least the first wireless base station device and the second wireless base station device based on the first control channel, the information which indicates new data or retransmission data of the first control channel being generated corresponding to the second control channel transmitted by the control channel transmission unit.