The truck operation system that operates a plurality of trucks for transporting products, components, and materials associated with processing in a processing plant in which a plurality of processing machines are installed has: a truck operation display device that is provided to each of the trucks so as to carry out displaying to an operator for truck operation; and a production management device that generates a truck management signal for enabling the operator to use an appropriate truck according to an operation of each of the processing machines based on a processing program of the corresponding processing machine in the processing plant, wherein the production management device transmits the truck management signal to the truck operation display device, and the truck operation display device carries out light displaying on the basis of the truck management signal. Thus, the operator can use and operate the appropriate truck by watching the display.
