The present invention is to provide an output control system in which an information processing apparatus instructs an image output apparatus to output image data, and in which the image output apparatus outputs the image data. The output control system is configured by an image output apparatus 1 and a plurality of information processing apparatuses 7. The information processing apparatus 7 includes an output data creation section 14 which generates output data from image data to be processed. When an image data file to be processed is opened, a control section 13 instructs the output data creation section 14 to generate output data of the first page of the image data to be processed without depending on an output instruction from a user, and transmits the output data to the image output apparatus 1. The image output apparatus 1 temporarily holds the received output data. When the output instruction is inputted from the user, the image output apparatus 1 outputs the temporarily held output data.