The program recorded on the recording medium 700 may be loaded into a computer 600 shown in FIG. 29 and the functions may be realized on the computer 600. [0207] The computer 600 includes a CPU (Central Processing Unit) 610 that executes the program, an input unit 620 such as a keyboard and a mouse, a ROM (Read Only Memory) 630 that stores various kinds of data, a RAM (Random Access Memory) 640 th