A display-and-input device comprising: a display portion and a touch panel portion provided with respect to the display portion and configured to accept input by a user to detect a touched position and a tap-and-drag operation in which, while a touch is maintained, a touched position is moved, wherein the display portion is configured to display a screen (S1, S2, S3) that shows selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) for selecting among a plurality of setting items, and a setting screen of a selected one of the setting items, display, after a touch is made at a display position of a selection key (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), when the touch is detected to be released without completing a tap-and-drag operation, in place of the screen (S1, S2, S3) for displaying the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), a setting screen of a setting item corresponding to the selection key (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) displayed at a touched position, display, when a tap-and-drag operation is detected within a display position of the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), in place of the entire screen (S1, S2, S3) for displaying the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), a setting item explanation screen, display, when a single tap-and-drag operation is detected across a plurality of the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), a first page of a first setting item explanation screen corresponding to one of the plurality of the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) with respect to which the tap-and-drag operation has been made wherein the first setting item explanation screen comprises a NEXT PAGE key, display, when the NEXT PAGE key is operated while the first setting item explanation screen does not show a last page of the first setting item explanation screen, a next page of the first setting item explanation screen, and display, when the NEXT PAGE key is operated while the first setting item explanation screen shows the last page of the first setting item explanation screen, a setting item explanation screen of another setting item that has not yet been displayed out of the setting item explanation screens corresponding to the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) with respect to which the tap-and-drag operation has been made, wherein the setting item explanation screens are help screens that explain setting items corresponding to selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) with respect to which the tap-and-drag operation has been made. a display portion and a touch panel portion provided with respect to the display portion and configured to accept input by a user to detect a touched position and a tap-and-drag operation in which, while a touch is maintained, a touched position is moved, a touched position and a tap-and-drag operation in which, while a touch is maintained, a touched position is moved, wherein the display portion is configured to display a screen (S1, S2, S3) that shows selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) for selecting among a plurality of setting items, and a setting screen of a selected one of the setting items, display, after a touch is made at a display position of a selection key (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), when the touch is detected to be released without completing a tap-and-drag operation, in place of the screen (S1, S2, S3) for displaying the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), a setting screen of a setting item corresponding to the selection key (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) displayed at a touched position, display, when a tap-and-drag operation is detected within a display position of the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), in place of the entire screen (S1, S2, S3) for displaying the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), a setting item explanation screen, display, when a single tap-and-drag operation is detected across a plurality of the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612), a first page of a first setting item explanation screen corresponding to one of the plurality of the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) with respect to which the tap-and-drag operation has been made wherein the first setting item explanation screen comprises a NEXT PAGE key, display, when the NEXT PAGE key is operated while the first setting item explanation screen does not show a last page of the first setting item explanation screen, a next page of the first setting item explanation screen, and display, when the NEXT PAGE key is operated while the first setting item explanation screen shows the last page of the first setting item explanation screen, a setting item explanation screen of another setting item that has not yet been displayed out of the setting item explanation screens corresponding to the selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) with respect to which the tap-and-drag operation has been made, wherein the setting item explanation screens are help screens that explain setting items corresponding to selection keys (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 610, 611, 612) with respect to which the tap-and-drag operation has been made.