Provided is a system and method for sharing position information using a mobile communication system. The system includes the mobile communication system providing a short message service; at least one second navigation terminal for detecting the position information from a received position information short message, mapping the detected position information to map data, and transmitting a position information short message; and a first navigation terminal for receiving and storing a proper number of each second navigation terminal, transmitting a position information short message, receiving the position information short message from the navigation terminal, and mapping a position based on the position information to the map data.