PLANT MANAGEMENT SYSTEM AND MANAGEMENT DEVICE

A plant management system 1 includes: a control device 20; and a management device 30. The control device 20 includes: a manipulation parameter setting unit that sets values of a plurality of manipulation parameters; a state parameter acquisition unit that acquires values of state parameters indicating an operating condition of the plant 3; and a transmitter that transmits the values of the manipulation parameters and the values of state parameters to the management device 30. The management device 30 includes: an acquisition unit that acquires the values of the manipulation parameters and the values of state parameters from the control device 20; a database that stores set values of manipulation parameters and actually measured values or predicted values of a plurality of state parameters when the plant 3 is operated based on the set values, corresponding to each other; and a determination unit that determines a set value of a manipulation parameter capable of improving a value of a predetermined state parameter of the plant by referring to the values of the manipulation parameters and the values of the state parameters acquired by the acquisition unit and to correspondence stored in the database between the set values of the plurality of manipulation parameters and the actually measured or predicted values of the plurality of state parameters and that presents the set value thus determined to the control device.