An information processing device comprising: a control section configured in such a manner that if aggregated data (403, 475, 505) combining a plurality of data items is transmitted, by the device, to a destination device and if a retransmission request frame for the aggregated data is received from the destination device, the control section performs control to collectively transmit (405, 482, 512) undelivered data items corresponding to the retransmission request frame to the destination device, wherein the undelivered data items of the plurality of data items are identified in the retransmission request frame, wherein the control section sets a transmission timing of the retransmission request frame to be transmitted from the destination device if undelivered data exists in the aggregated data (403, 475, 505), the control section communicating the transmission timing to the destination device using a transmission request to be transmitted to the destination device before the transmission of the aggregated data (403, 475, 505), and wherein, in transmitting the aggregated data (403, 475, 505) to a plurality of destination devices (100, 102, 103), the control section sets the transmission timing of the retransmission request frames (404, 480, 506, 507) to be transmitted from the destination devices (100, 102, 103) if there exists undelivered data in the aggregated data (403, 457, 505), as a time duration (t10, t12) spanning a period of time that accommodates the separate transmission of a number of retransmission request frames that is fewer than the number of destination devices (100, 102, 103). a control section configured in such a manner that if aggregated data (403, 475, 505) combining a plurality of data items is transmitted, by the device, to a destination device and if a retransmission request frame for the aggregated data is received from the destination device, the control section performs control to collectively transmit (405, 482, 512) undelivered data items corresponding to the retransmission request frame to the destination device, wherein the undelivered data items of the plurality of data items are identified in the retransmission request frame, wherein the control section sets a transmission timing of the retransmission request frame to be transmitted from the destination device if undelivered data exists in the aggregated data (403, 475, 505), the control section communicating the transmission timing to the destination device using a transmission request to be transmitted to the destination device before the transmission of the aggregated data (403, 475, 505), and wherein, in transmitting the aggregated data (403, 475, 505) to a plurality of destination devices (100, 102, 103), the control section sets the transmission timing of the retransmission request frames (404, 480, 506, 507) to be transmitted from the destination devices (100, 102, 103) if there exists undelivered data in the aggregated data (403, 457, 505), as a time duration (t10, t12) spanning a period of time that accommodates the separate transmission of a number of retransmission request frames that is fewer than the number of destination devices (100, 102, 103).