1. An image playback method comprising the steps of: determining a time elapsed from image acquisition based on an acquisition date and time of image information obtained by the image acquisition and a current date and time; determining a fading rate based on the determined elapsed time; subjecting the image information to image processing in which the image information is faded based on the determined fading rate; displaying the image-processed image information to play back the image; counting a display time for which the image-processed image information is displayed; and determining a restoration rate based on the counted display time; wherein the image information is subjected to image processing in which the image information is faded based on the fading rate and the restoration rate in the step of subjecting the image information to the image processing in which the image information is faded.