Abstract: An in-vehicle information apparatus includes a main unit having a display device, and a navigation unit providing a navigation function to the main unit. The navigation unit includes a navigation processing unit a sub unit providing an addition function to the navigation unit, and a navigation unit screen generating unit which generates a navigation unit screen for displaying information concerning a function which the navigation unit provides. The main unit includes an operation unit which receives an input for selecting a function from a user, a main unit screen generating unit which generates a main unit screen for displaying information concerning a function which the main unit provides, and a video selector which selects one of the navigation unit screen and the main unit screen.