A request distribution system connected with a first and second processing system to adjust resources for use in request processing according to a received request amount includes a reception unit that receives a request, and a determination and a transmission unit. The determination unit determines a processing system as a transmission destination. The transmission unit transmits the request to the determined processing system. When a processing system for processing a request from a predetermined network system is switched from the first to the second processing system, the determination unit determines the first and second processing systems as respective transmission destinations so that the requests are distributed to the first and second processing systems between a start and end of the switching. When the second processing system is determined as the transmission destination per the amount of requests, resources to be used in the second processing system request processing are adjusted.
