An image read processing device connected to a scanner reading an image of a document comprises at least a memory and a controller. The memory comprises a setting information recording unit that records a setting information with an application to start up depending on a document size defined there. The controller comprises a scanner controlling unit that controls the scanner, a document size checking unit that checks the document size of the image read out by the scanner according to the control of the scanner controlling unit, and a start-up application determining unit that determines the application depending on the document size checked by the document size checking unit, based on the setting information recorded in the setting information recording unit and starts up the application.