A terminal comprising: a touch panel that is adapted to display an image and to accept a touch operation; and a terminal control unit that is adapted to cause the touch panel to display a vehicle control screen on which an operation button allowing the touch operation is displayed, moves a position of the operation button following a movement of a position of the touch operation, and maintains a state where the touch operation is performed on the operation button when the position of the touch operation moves after the touch operation is performed on the operation button displayed on the vehicle control screen; and transmit a propulsion instruction signal instructing propulsion of a vehicle to an information processing device provided in the vehicle while the touch operation is being performed on the operation button displayed on the vehicle control screen, and stops transmission of the propulsion instruction signal in response to ending of the touch operation on the operation button, characterized in that the terminal control unit is adapted to cause the touch panel to display a lock screen on which a slide bar and a slide button are displayed, the slide button being positioned at one end of the slide bar, moving along the slide bar in accordance with a swipe operation, and moving to the one end of the slide bar in response to ending of the swipe operation; and change a screen to be displayed on the touch panel from the lock screen to the vehicle control screen when the slide button is positioned at another end of the slide bar by the swipe operation for a predetermined period of time and changes the slide button positioned at the other end of the slide bar to the operation button so as to cause the slide button to function as the operation button. a touch panel that is adapted to display an image and to accept a touch operation; and a terminal control unit that is adapted to cause the touch panel to display a vehicle control screen on which an operation button allowing the touch operation is displayed, moves a position of the operation button following a movement of a position of the touch operation, and maintains a state where the touch operation is performed on the operation button when the position of the touch operation moves after the touch operation is performed on the operation button displayed on the vehicle control screen; and transmit a propulsion instruction signal instructing propulsion of a vehicle to an information processing device provided in the vehicle while the touch operation is being performed on the operation button displayed on the vehicle control screen, and stops transmission of the propulsion instruction signal in response to ending of the touch operation on the operation button, cause the touch panel to display a vehicle control screen on which an operation button allowing the touch operation is displayed, moves a position of the operation button following a movement of a position of the touch operation, and maintains a state where the touch operation is performed on the operation button when the position of the touch operation moves after the touch operation is performed on the operation button displayed on the vehicle control screen; and transmit a propulsion instruction signal instructing propulsion of a vehicle to an information processing device provided in the vehicle while the touch operation is being performed on the operation button displayed on the vehicle control screen, and stops transmission of the propulsion instruction signal in response to ending of the touch operation on the operation button, cause the touch panel to display a lock screen on which a slide bar and a slide button are displayed, the slide button being positioned at one end of the slide bar, moving along the slide bar in accordance with a swipe operation, and moving to the one end of the slide bar in response to ending of the swipe operation; and change a screen to be displayed on the touch panel from the lock screen to the vehicle control screen when the slide button is positioned at another end of the slide bar by the swipe operation for a predetermined period of time and changes the slide button positioned at the other end of the slide bar to the operation button so as to cause the slide button to function as the operation button.