The present invention provides a source node device and a destination node in a data processing system, a data processing system, and a decoding method. A working machine controller receives a delivery pressure signal P and controls a regulator such that, when the delivery pressure of a hydraulic pump exceeds a predetermined pressure P1, the displacement of the hydraulic pump does not exceed a value decided in accordance with a preset pump absorption torque curve. The programmable resistance memory material may be a chalcogenide. A control device sequentially causes the indicating unit of each electrode to display the information and simultaneously cause the image sensing device to acquire the stereoscopic images of each electrode.