1. A photograph printing method for printing on a photographic printing paper a plural number of images which are photographed on a film, said method comprising steps of: detecting photographing information of said film; determining frames of said film which have photographing conditions which are similar to one another by comparing said photographing information of said individual frames with one another; determining similar print conditions corresponding to the similar photographing conditions of said frames thus determined; and printing said images in said frames using said similar print conditions thus determined; wherein in said detecting step, photographing information is read out from recording positions of said film; and wherein in said frame determining step, a similarity coefficient of said photographic conditions of compared images is calculated by multiplying the square or the absolute value of the difference between the corresponding values of each item by a weighting factor predetermined for each item, summing the products of all of the items, and in a case that said similarity coefficient is equal to or smaller than a predetermined value, said compared images are determined to provide the similar photographing conditions as each other.