The computer 200 shown in FIG. 10 includes a central processing unit (CPU) 210 that executes the program, an input device 220 such as a keyboard and a mouse, a read-only memory (ROM) 230 that stores various kinds of data, a random access memory (RAM) 240 that stores operation parameters, a reading unit 250 that reads the program from the recording medium 300, and an output unit 260 such as a displ