The present disclosure discloses an upper-order computer, a lower-order computer, a monitoring system and a monitoring method, so as to eliminate the disadvantages of low standardization level and small scale in manually setting and adjusting performance parameters. The upper-order computer includes a central control module and an information interacting module, the information interacting module including a human-computer interacting unit, and the central control module including a processing unit, a display control unit and a parameter configuring unit, wherein the processing unit is adapted for controlling a lower-order computer by sending control commands; the display control unit is adapted for processing effective operating data acquired from the lower-order computer, and is adapted for instructing the human-computer interacting unit to perform presenting; and the parameter configuring unit is adapted for configuring parameters of the lower-order computer by sending parameter configuring commands. It can be seen that the upper-order computer is capable of presenting the processed effective operating data and configuring parameters. Compared with directly setting and adjusting the controller by human, the technical solution of the present disclosure has the advantages of high standardization level and large scale.