At a server, a load monitoring unit monitors whether or not a predetermined condition regarding processing of requests is satisfied. In the case where the predetermined condition is not satisfied, a wait-time calculating unit calculates a wait time as a time parameter for controlling the speed of time flow at a player terminal side. A request executing unit executes requests in the order of arrival and generates responses. A response sending control unit executes control to send responses to the player terminals that have sent the corresponding requests and to also send to the player terminals information representing the wait time in the case where the wait time has been calculated.