An information processing device comprising: a display configured to display a plurality of graphical faceplates side by side, the graphical faceplates corresponding to control targets (100, 100a, 100b, 100c, 100d) respectively, the graphical faceplates representing states of the control targets (100, 100a, 100b, 100c, 100d) respectively, a main screen being displayed in a display area of each of the graphical faceplates; an operation unit (310, 400) which is used for operating the graphical faceplates; and a controller configured to switch the main screen of one of the graphical faceplates displayed in the display area to a sub screen for operating the control target (100, 100a, 100b, 100c, 100d) of one of the graphical faceplates based on an operation performed by the operation unit (310, 400), wherein the sub screen is provided for each of the graphical faceplates, wherein the main screen for each of the graphical faceplates displays a state of the graphical faceplate's corresponding control target, and does not display an input portion for operating the graphical faceplate's corresponding control target, wherein the sub screen for operating the control target of the one of the graphical faceplates displays the input portion for operating the control target of the one of the graphical faceplates, and wherein in response to the switching of the main screen of the one of the graphical faceplates to the sub screen for operating the control target of the one of the graphical faceplates, the controller prohibits the main screen displayed in the display area of another graphical faceplate of the plurality of the graphical faceplates from being switched to the sub screen of the other graphical faceplate. a display configured to display a plurality of graphical faceplates side by side, the graphical faceplates corresponding to control targets (100, 100a, 100b, 100c, 100d) respectively, the graphical faceplates representing states of the control targets (100, 100a, 100b, 100c, 100d) respectively, a main screen being displayed in a display area of each of the graphical faceplates; an operation unit (310, 400) which is used for operating the graphical faceplates; and a controller configured to switch the main screen of one of the graphical faceplates displayed in the display area to a sub screen for operating the control target (100, 100a, 100b, 100c, 100d) of one of the graphical faceplates based on an operation performed by the operation unit (310, 400), wherein the sub screen is provided for each of the graphical faceplates, wherein the main screen for each of the graphical faceplates displays a state of the graphical faceplate's corresponding control target, and does not display an input portion for operating the graphical faceplate's corresponding control target, wherein the sub screen for operating the control target of the one of the graphical faceplates displays the input portion for operating the control target of the one of the graphical faceplates, and wherein in response to the switching of the main screen of the one of the graphical faceplates to the sub screen for operating the control target of the one of the graphical faceplates, the controller prohibits the main screen displayed in the display area of another graphical faceplate of the plurality of the graphical faceplates from being switched to the sub screen of the other graphical faceplate.