A betting type of a betting ticket uniquely designating the order of arrival of one or more racers out of racers to participate in a race of a racing, a racer number pattern corresponding to the order of the racers in the betting type, and a receipt amount for the racer number pattern are received from a user (S2, S3), a betting type different from the received betting type is extracted (S6), a racer number pattern for the extracted betting type is extracted so as to cover all the received racer number patterns (S7), a first payout amount is calculated from odds information corresponding to the received betting type and racer number pattern and the receipt amount (S8), and an allotment amount to be allotted to the extracted racer number pattern is calculated so that the lowest second payout amount of second payout amount calculated from the odds information on the extracted betting type and racer number pattern becomes higher than an amount of money related to the first payout amount (S9).