The computer 1600 shown in the drawing includes a central processing unit (CPU) 1610 which executes the program, an input device 1620 such as a keyboard and or a mouse, a read only memory (ROM) 1630 which stores various data, a random access memory (RAM) 1640 which stores an operation parameter and the like, a reading device 1650 which reads the program from the recording medium 1700, and an outpu