Abstract: An information processing system includes an input device configured to sequentially transmit a plurality of first processing data pieces to each of a plurality of data processing devices, a data processing device of the plurality of data processing devices, coupled to the input device and configured to sequentially execute data processings on a plurality of first processing data pieces to generate a plurality of first processed data pieces, and an output device coupled to each of the plurality of data processing devices and configured to sequentially transmit a plurality of first data request signals to a first data processing device selected among the plurality of data processing devices, wherein the first data processing device sequentially transmits the plurality of first processed data pieces to the output device in response to the plurality of first data request signals from the output device, respectively.