In the above-explained embodiment, when the simulation program for executing the processing shown in FIG. 14 and FIG. 18 is stored on a recording medium such as an IC card memory, a floppy disk, an optical magnetic disk, a CD-ROM, etc., and also when the program stored on the recording medium is installed on a node (including the simulation machine 10 and the WWW server 20) on the distributed-obje