An operation method for a gaming machine sets a target payout rate, probabilities
of winning, and odds on a plurality of objects. The objects are rearranged in order
of the probability of winning. The odds on the object in first place are corrected
to odds with a predetermined number of digits. The probability of winning of the
object in the first place is corrected by the corrected odds. The difference between
the uncorrected probability of winning and the corrected probability of winning
is reflected in the probability of winning of the object in the subsequent place.
The odds on the object in the subsequent place are predetermined based on the corrected
probability of winning of the object in the subsequent place. The whole processing
is repetitively performed for the objects in all places.
