1. A process simulation system for executing a process simulation by simulating operations of various component elements constituting a production system so as to determine a process organization of the production system, comprising: an element arrangement data reading means for sequentially reading component element names which are combined with process identification names from an element arrangement data, the element arrangement data describing an arrangement of the various component elements constituting the production system with combinations of the process identification names and the component element names along a work flow; an element definition file reading means for sequentially reading element definition files corresponding to component element names which had been read in by the element arrangement data reading means from a plurality of element definition files, the element definition files describing simulation programs for executing operational simulations of the various component elements for each of the component elements; a program array preparing means for preparing a simulation program array by sequentially arranging simulation programs respectively described in element definition files which had been read in by the element definition file reading means; and a program execution means for simulating operations of the various component elements constituting the production system by executing a series of simulation programs included in the simulation program array prepared by the program array preparing means.