An image processing apparatus having a data converting unit which converts inputted image information into image data which can be outputted by an external output apparatus and an output control unit which outputs the converted image data to the output apparatus, includes: a storing unit which sequentially stores the image data in parallel with the output of the image data from the data converting unit to the output control unit; and an instructing unit which selects a desired one of the plurality of image data sequentially stored in the storing unit and instructs the output control unit to re-output the selected image data. When the re-output is instructed, the output control unit transfers the selected image data to the output apparatus from the storing unit.