| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow all players to equally enjoy a game by preventing only some players from gaining profit when a game value is put out to the players. SOLUTION: The number of medals (payment history BP), for which a player has paid and the number of medals received by the player (income history PP) each are related to ID of the player and recorded in a player information database. In the game of the player, actual put-out ratio PP/BP of the past is calculated from the payment history BP and income history PP. Then the actual put-out ratio is compared with a predetermined set put-out ratio P/B. As a result of this comparison, for a player whose ratio PP/BP is lower than the set put-out ratio, the kind of precious stones is determined based on the occurrence rate B wherein a precious stone which puts out a large number of medals is selected at a high probability. Thus, putting out of medals can be controlled per every player.</p> |
