1. A navigation system with switchable multi-language operating interfaces, comprising: a storage unit for storing installation programs and audio databases of the multi-language operating interfaces; a Basic Input/Output System (BIOS) for actuating the navigation system during a boot up thereof and controlling to display a selection interface of settings; a setup module for receiving a user selection from the selection interface; an installation module for loading and installing the corresponding installation program of multi-language operating interface from storage unit in accordance with the user selection ; and a memory module for storing the installed multi-language operating interface.