NAVIGATION DEVICE, NAVIGATION METHOD, AND NAVIGATION PROGRAM

Because a navigation device or method according to the present invention extracts only route guidance expressions which a speaking person, such as a fellow passenger, provides for the driver, interprets the abstract route guidance expressions to determine a concrete route guidance expression, and outputs information to be presented corresponding to the concrete route guidance expression, the navigation device enables the driver to understand the content intuitively and can prevent the driver from mishearing the speaking person's utterance and from driving the vehicle toward a direction which the speaking person does not intend.