To provide a communication navigation system capable of operating a
plurality of communication navigation terminal apparatuses in
synchronization and switching among them while maintaining settings
related to navigation. A navigation system is comprised of an information
server apparatus, a portable terminal apparatus and a vehicle terminal
apparatus for performing a navigation process, and when switching a
movable body for performing the navigation, it switches a sending
destination of navigation data such as map information, that is, a
terminal apparatus while maintaining settings such as the destination
information before connecting so as to continuously conduct the navigation
such as route searching and route guidance.
