Chemical plant management device, chemical plant management system, and chemical plant management method

This chemical plant management device is characterized by being provided with: a storage unit that stores information on a first product generated by feeding a first raw material into a first reactor in a chemical plant and using a first operating condition; an input unit into which a second product to be generated by the second reactor is input; and a control unit that generates a plurality of characteristic groups such that a plurality of first products having characteristics within a predetermined range are included on the basis of information on the first products, and that generates a plurality of characteristic groups such that a plurality of second products having characteristics within a predetermined range are included on the basis of the characteristics of the second products and the characteristic range of the plurality of characteristic groups. A predetermined characteristic group including the second product is identified from among the plurality of characteristic groups, and a second raw materia