System, method and program comprising information server apparatus and communication terminal apparatus for navigation using different transport means

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 (100) is comprised of an information server apparatus (110), a portable terminal apparatus (120) and a vehicle terminal apparatus 140 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.