Patent ID: 7756638

Claim:
A mobile terminal device having a navigation function, comprising: a direction detection unit for detecting a direction of the mobile terminal device; a position detection unit for detecting a current position of the mobile terminal device; a style detection unit for detecting a style of the mobile terminal device which is variable by movable casing; a display control unit for controlling one or more display units so as to be switched to display either one of a detailed navigation screen showing a route from a current position to a designated destination, or a simple navigation screen showing a direction toward the destination with respect to the current position, in accordance with the style detected by the style detection unit; and a direction calculation unit for calculating the direction to the destination with respect to the current position detected by the position detection unit in accordance with the direction detected by the direction detection unit, when the simple navigation screen is displayed by the display control unit; wherein the display control unit generates the simple navigation screen showing the direction calculated by the direction calculation unit, and displays the generated simple navigation screen in accordance with a forward direction based on the direction of the mobile terminal device detected by the direction detection unit.