1. An index print producing method used for an image processing system in which: the processing content of image processing of original image data of each original image of a plurality of original images is determined and the image processing is performed; and the image data which has undergone the image processing is used to perform a main image output processing comprising at least one of recording the image on a recording material, displaying the image on a display means, and storing the image data on an information recording medium, wherein said index print producing method comprises the steps of: a first image processing equivalent to the image processing performed at the time of the output of the main image is performed on the original image data of the plurality of original images or a second image processing is performed to append information representing the processing contents of the image processing performed at the time of the output of the main image to the original image data of the plurality of original images, the image data of the plurality of original images having undergone the first or second image processing is disposed in a predetermined layout, and recording of the images on an image recording material is performed using the image data disposed in the predetermined layout to create an index print.