1. A print processing method for a printer that has a plurality of functions and a plurality of paper output methods and executes print for each of the functions, comprising: executing, when prints by the plurality of functions are simultaneous/parallel processed, printing of print images, which are created by image processes associated with the respective functions, by calculating a print order on the basis of a time at which each print image is created and a preset print process ratio between the functions; executing, when the preset print process ratio is altered where necessary during the printing, printing of remaining print images at the time of the alteration by re-calculating the print order on the basis of the altered process ratio; and sorting paper sheets, on which the printing is effected, according to each of the functions by the plurality of paper output methods.