A display input device including: a display unit configured to display screens in a hierarchical structure and display a button in a screen; and a touch panel unit for accepting an operation on the screen displayed on the display unit including an operation on the button of said screen, wherein the display unit is configured to switch a screen to be displayed from a screen that is currently displayed to one of a lower layer screen and an upper layer screen in accordance with the button that is operated on the touch panel unit in a normal mode, the touch panel unit is configured to make a transition into a transmission transition mode in response to a predetermined transmission start operation in which, in the normal mode, a touch in a display region of a given button on the screen is kept continuously for a predetermined long press period, the display unit is configured to perform, upon said transition of said touch panel unit, a first transmission transition display in which the screen on which the transmission start operation was performed is taken as a first transition source screen while a screen that belongs to a next lower layer of the transition source screen and that is displayed by operating the given button that was long pressed is taken as a first transition destination screen and a ratio of display is changed as time passes such that the first transition source screen gradually disappears and the first transition destination screen gradually appears so that the screen to be displayed is changed, and the display unit is configured, while the transmission start operation is continued, to perform a second transmission transition display toward a lower layer, in which the first transition destination screen after the transition is completed with total transmission of the first transition destination screen is regarded as a second transition source screen, and a screen that belongs to a next lower layer of the second transition source screen and that is determined based on a predetermined path of screen transition or determined by selection of a button on the transition source screen during the transmission transition display toward the transition destination screen is regarded as a second transition destination screen. a display unit configured to display screens in a hierarchical structure and display a button in a screen; and a touch panel unit for accepting an operation on the screen displayed on the display unit including an operation on the button of said screen, wherein the display unit is configured to switch a screen to be displayed from a screen that is currently displayed to one of a lower layer screen and an upper layer screen in accordance with the button that is operated on the touch panel unit in a normal mode, the touch panel unit is configured to make a transition into a transmission transition mode in response to a predetermined transmission start operation in which, in the normal mode, a touch in a display region of a given button on the screen is kept continuously for a predetermined long press period, the display unit is configured to perform, upon said transition of said touch panel unit, a first transmission transition display in which the screen on which the transmission start operation was performed is taken as a first transition source screen while a screen that belongs to a next lower layer of the transition source screen and that is displayed by operating the given button that was long pressed is taken as a first transition destination screen and a ratio of display is changed as time passes such that the first transition source screen gradually disappears and the first transition destination screen gradually appears so that the screen to be displayed is changed, and the display unit is configured, while the transmission start operation is continued, to perform a second transmission transition display toward a lower layer, in which the first transition destination screen after the transition is completed with total transmission of the first transition destination screen is regarded as a second transition source screen, and a screen that belongs to a next lower layer of the second transition source screen and that is determined based on a predetermined path of screen transition or determined by selection of a button on the transition source screen during the transmission transition display toward the transition destination screen is regarded as a second transition destination screen.