processing and the process advances to step s 360 refer to fig6 a in a case that a judgment is made that the j th exclusive item and the n th item are not same no at step s 940 the cpu 11 increments the second area element number n by 1 at step s 945 and at step s 950 the cpu 11 makes a judgment of whether or not the second area element number n is greater than the number of items n in the second area 42 in a case that the second area element number n is not greater than the number of items n in the second area 42 no at step s 950 the process returns to step s 940 in a case that the second area element number n is greater than the number of items n in the second area 42 yes at step s 950 the cpu 11 increments the exclusive item element number j by 1 at step s 955 and at step s 960 the cpu 11 makes a judgment of whether or not the exclusive item element number j is greater than the number of exclusive items j at the current point of time in a case.