Automatic communication method between smart phone and navigation device when charging smart phone

PURPOSE: An automatic communication method for a smart phone and a navigation device is provided to automatically connect wireless communication between a smart phone and a navigation device while in a charging state. CONSTITUTION: A smart phone(100) confirms whether an identifier of a device which connects by a predetermined wireless communication is matched with an identifier stored in the smart phone in order to confirm whether a navigation device(200) connects to the device which connects by the predetermined wireless communication. The smart phone senses connection to a USB(Universal Serial Bus) cable. The smart phone automatically executes an application for the navigation device. The smart phone senses a wireless charging state of a magnetic inducing method or a resonance magnetic inducing method. [Reference numerals] (AA) Charge sensing; (BB) Wireless communication automatic connection