| 摘要 |
PROBLEM TO BE SOLVED: To provide an item used by a user by a lottery, and to enable the winning probability to change according to predetermined conditions.SOLUTION: A server device for providing a plurality of kinds of items to a user by a lottery includes: a probability control part for performing control so as to vary an item winning probability, namely a probability that a lottery of an item provided from the plurality of kinds of items is held; and an output part for outputting a lottery result of an item obtained by the lottery held based on the controlled item winning probability. |
