To provide a flow control method for a calculator capable of efficient flow control depending on a resource of the calculator and a resource necessary for execution of a request.

In the flow control method for a calculator, a request is stored in a queue 121 in response to reception of the request from a client 3, and a request firstly stored in the queue 121 is taken out one by one to calculate resource quantity necessary for execution of the request on the basis of a resource calculation table 151 with a calculation formula corresponding to a destination of the request. The calculated resource quantity is determined whether to be secured on the basis of a resource management table 152, and when the calculated resource quantity is secured, use information including the calculated resource quantity is registered in the resource management table 152 to instruct a Web application 160 being the request destination to execute processing.