Navigation system

A navigation system (100) has a first communication terminal unit (A); a second communication terminal unit (B) which communicates with the first communication terminal unit (A); and a car navigation apparatus (S). The first communication terminal unit (A) transmits the self-location information to the second communication terminal unit (B). The second communication terminal unit (B) receives the location information transmitted from the first communication terminal unit (A); and transfers the received location information to the car navigation apparatus (S). The car navigation apparatus (S) sets up a destination on the basis of the location information transferred from the second communication terminal unit (B) and searches for the route up to the destination.