A batch request processing device that, when a response corresponding to a performance request issued by a GUI processing device is stored in a response storage device, outputs an output command for outputting the response to the GUI processing device, whereas when no response corresponding to the performance request is stored in the response storage device, commands a request pattern management device to predict a request which may be issued following the performance request and generate a request pattern which consists of the performance request and the predicted request, and generates a batch request including the request pattern generated by the request pattern management device.