The information processor executes the processes of: (a) setting a winning probability of second random determination based on a winning probability corresponding to a condition set by a setting unit which sets one of conditions associated with different winning probabilities; (b) determining whether to execute the first random determination by the second random determination based on the winning probability set in the process (a); (c) when a win is achieved in the second random determination in the process (b), executing the first random determination; and (d) when a result of the first random determination in the process (c) is different from a predetermined result, executing the first random determination again.