An information processing device, separate from an image processing apparatus, which controls the image processing apparatus and includes a display unit, a volatile memory store image data, and a nonvolatile memory. The information processing device also includes an image data acquisition unit that acquires image data processed by the image processing apparatus page by page, an image data storage processor that compares the image data acquired by the image data acquisition unit for each page with the image data stored in the volatile memory and to store the image data in either the volatile memory or the nonvolatile memory based on comparison, a display image generator that generates a display image to be displayed on the display unit based on the image data for each page stored in either the volatile memory or the nonvolatile memory, and a display image output controller that displays the display image generated by the display image generator on the display unit.