Vehicle apparatus, the navigation system and a control method thereof

A vehicle-mounted device 10 includes reception means 60 for receiving a telephone number and positional information about a first point location from a portable device 30, storage means 70 for storing telephone numbers and positional information about multiple second point locations, first comparison means 62a for comparing the telephone number of the first point location with the telephone numbers of the multiple second point locations, second comparison means 62b for comparing the positional information about the first point location with the positional information about the multiple second point locations, display means 63 for displaying a point of interest on a map on the basis of comparison results of the first and second comparison means by using either the positional information about the first point location or the positional information about one of the multiple second point locations corresponding to the first point location. A navigation system 100 includes the above vehicle-mounted device 10 and the portable device 30.