A communication control device comprises a calculation part for calculating the number of frames and the frame length for transmitting the transmit data, a payload division part for dividing the transmit data into frame units based on the calculation results of the calculation part, and a header generation part for generating a header to be appended to the transmit data of frame unit based on the calculation results of the calculation part in the midst of dividing the transmit data by the payload division part. Thereby, the parallel processing ability of the hardware can be exhibited, a memory management method can be simplified, and the transmit data can be outputted as the frame at high speed.