Abstract: To increase the number of views on posting information through an improvement in the quality of the posting information, and thus to improve the utilization rate of advertisement information. A management server device in an SNS system includes a posting display instructor, an advertisement display instructor, an evaluation point receiver, a posting-specific evaluation point calculator, a user-specific evaluation point calculator, a reward point calculator, a total reward point calculator, an exchange rate calculator, and an exchange rate display instructor. The reward point calculator calculates, for each of users, reward points exchangeable for money from reward resources based on user-specific evaluation points. The total reward point calculator calculates total reward points by counting the reward points given to users eligible for rewards from the reward resources. The exchange rate calculator calculates an exchange rate by dividing a reward resource amount by the total reward points.