Provided is a navigation system having a first and a second input screen display unit. The first input screen displays a first input device screen for receiving input of a first option t for selection t to which any position on the display unit is input. The second input screen displays on the first input screen, a second input device screen when input to the second input device is received of a second option and the second option being arranged on the second input device screen in a direction corresponding to a specific direction, the second option being selected by the second input device and is a function different from a function selected in the first option. A button on the second input device issues a command to switch the selected second option positioned in the specific direction and a button that issues a command to determine an option.