A display control apparatus for a printer, the display control apparatus comprising: a display control unit which controls a display to display a setting screen indicating a plurality of set items (50, 60, 70, 80); a setting unit which sets setup values for the plurality of set items (50, 60, 70, 80) displayed on the display, respectively; a processing unit which executes processing according to a combination of the setup values set by the setting unit; and a restriction unit which restricts setting the setup values by the setting unit so as not to satisfy at least one combination of a plurality of setup values, wherein the processing unit is prohibited from executing the processing with the at least one combination of a plurality of set up values, wherein a plurality of restriction conditions is defined by a condition setup value for each restriction condition, respectively, and at least one restriction setup value for each restriction condition, respectively, and wherein the restriction unit restricts change in a setup value so that the value set as one of the at least one restriction setup values for one of the plurality of restriction conditions is not set, when the value defined as the condition setup value for this one of the plurality of restriction conditions is set, wherein the display control unit controls the display to display each one of a plurality of restriction set item groups in a first mode, wherein a restriction set item group is defined for each restriction condition by including all set items corresponding to the condition setup value for this restriction condition and the at least one restriction setup value for this restriction condition, respectively, and to display set items other than the restriction set item groups in a second mode different from the first mode, wherein the first mode includes a plurality of display modes for the plurality of restriction conditions, respectively, the plurality of display modes being different from one another, and wherein the display control unit controls the display to display each one of the plurality of restriction set item groups for the plurality of restriction conditions in the corresponding display mode as the first mode. a display control unit which controls a display to display a setting screen indicating a plurality of set items (50, 60, 70, 80); a setting unit which sets setup values for the plurality of set items (50, 60, 70, 80) displayed on the display, respectively; a processing unit which executes processing according to a combination of the setup values set by the setting unit; and a restriction unit which restricts setting the setup values by the setting unit so as not to satisfy at least one combination of a plurality of setup values, wherein the processing unit is prohibited from executing the processing with the at least one combination of a plurality of set up values, wherein a plurality of restriction conditions is defined by a condition setup value for each restriction condition, respectively, and at least one restriction setup value for each restriction condition, respectively, and wherein the restriction unit restricts change in a setup value so that the value set as one of the at least one restriction setup values for one of the plurality of restriction conditions is not set, when the value defined as the condition setup value for this one of the plurality of restriction conditions is set, wherein the display control unit controls the display to display each one of a plurality of restriction set item groups in a first mode, wherein a restriction set item group is defined for each restriction condition by including all set items corresponding to the condition setup value for this restriction condition and the at least one restriction setup value for this restriction condition, respectively, and to display set items other than the restriction set item groups in a second mode different from the first mode, wherein the first mode includes a plurality of display modes for the plurality of restriction conditions, respectively, the plurality of display modes being different from one another, and wherein the display control unit controls the display to display each one of the plurality of restriction set item groups for the plurality of restriction conditions in the corresponding display mode as the first mode.