1. An image data processing apparatus, comprising: an execution device that executes a predetermined data processing of image data; a use determination device that determines at least one used amount in at least one specified portion which is used when the data processing is executed; an identification device that identifies an attribute of the image data; an execution determination device that determines whether or not to execute the data processing of the image data based on the attribute of the image data identified by the identification device and the at least one used amount determined by the use determination device; and a control device that makes the execution device execute the data processing of the image data when it is determined by the execution determination device to execute the data processing.