An image forming apparatus comprising: a plurality of paper feed units; and display means for displaying a paper selection screen (711 911, 1012, 1112) for selecting a paper to be used in print processing, wherein the paper selection screen displays items of information of a predetermined number of paper feed units among the plurality of paper feed units; characterized in that the predetermined number of paper feed units displayed on the paper selection screen is less than the total number of the plurality of paper feed units; and by further comprising: control means for: (i) controlling said display means to display the paper selection screen on which the items of information of the predetermined number of paper feed units are displayed in a predetermined order of the plurality of paper feed units in a case that no error has occurred, and (ii) controlling said display means to display, regardless of the predetermined order at least in part, the paper selection screen (911, 1012, 1112) on which an item of information (901, 1001, 1101) of a paper feed unit that is related to an error is displayed in a case that the error has occurred. a plurality of paper feed units; and display means for displaying a paper selection screen (711 911, 1012, 1112) for selecting a paper to be used in print processing, wherein the paper selection screen displays items of information of a predetermined number of paper feed units among the plurality of paper feed units; characterized in that the predetermined number of paper feed units displayed on the paper selection screen is less than the total number of the plurality of paper feed units; and by further comprising: control means for: (i) controlling said display means to display the paper selection screen on which the items of information of the predetermined number of paper feed units are displayed in a predetermined order of the plurality of paper feed units in a case that no error has occurred, and (ii) controlling said display means to display, regardless of the predetermined order at least in part, the paper selection screen (911, 1012, 1112) on which an item of information (901, 1001, 1101) of a paper feed unit that is related to an error is displayed in a case that the error has occurred. control means for: (i) controlling said display means to display the paper selection screen on which the items of information of the predetermined number of paper feed units are displayed in a predetermined order of the plurality of paper feed units in a case that no error has occurred, and (ii) controlling said display means to display, regardless of the predetermined order at least in part, the paper selection screen (911, 1012, 1112) on which an item of information (901, 1001, 1101) of a paper feed unit that is related to an error is displayed in a case that the error has occurred. (i) controlling said display means to display the paper selection screen on which the items of information of the predetermined number of paper feed units are displayed in a predetermined order of the plurality of paper feed units in a case that no error has occurred, and (ii) controlling said display means to display, regardless of the predetermined order at least in part, the paper selection screen (911, 1012, 1112) on which an item of information (901, 1001, 1101) of a paper feed unit that is related to an error is displayed in a case that the error has occurred.