A data communication apparatus (a) determines a segment size and a segment data size in accordance with a size of a receiving buffer of the destination node, the size of the receiving buffer being determined by the destination node in accordance with a maximum payload size that can be received by the destination node, (b) divides object data into segments in accordance with the segment size, and (c) divides each segment into a plurality of segment data in accordance with the segment data size. The data communication apparatus (c) generates packets from the plurality of segment data, and (d) transfers the packets from the data communication apparatus to the destination node via a logical connection set between te data communication apparatus and the destination node, the logical connection being set by a controller.