Abstract: In an information processing system including a first cluster which issues a control instruction for controlling an input/output device of another cluster and a second cluster which executes processing by the input/output device according to the control instruction, which are connected through a network interconnecting clusters, a processor mounted on the first cluster comprises a cluster discrimination unit for discriminating a cluster which executes the control instruction and an instruction transfer unit for transferring the control instruction to the corresponding second cluster depending on the judgment of the cluster discrimination unit, while a data transfer processing device mounted on the second cluster comprises a transfer buffer for temporarily storing the data to be transferred to another cluster, a transfer buffer control unit for controlling reading and writing of the data from and into the transfer data storage unit, and a transfer control unit for controlling the transfer buffer control unit a

Abstract: A data transfer control device comprises an instruction storage units and for storing a data transfer instruction, an instruction decoding unit for reading the data transfer instruction from the instruction storage units and to decode the content thereof, a shared memory access unit for reading and writing the data through access to a shared memory in the same cluster, a data transfer unit for sending the data to a network among clusters and receiving the data from the network among clusters and a transfer control unit for controlling the shared memory access unit and the data transfer unit according to the data transfer instruction decoded by the instruction decoding unit, as well as for storing the data transfer instruction issued from another cluster into a second instruction storage unit when the data transfer unit receives the data transfer instruction from another cluster through the network among clusters.