1. A position information transmission method for transmitting and receiving road shape information and event information, and identifying an event position, the method comprising the steps of: intermittently selecting nodes in a target road section on a digital map; transmitting road shape information and event information; executing a map matching based on the road shape information including coordinate information of the selected nodes; determining positions of the selected nodes; obtaining a road between the selected nodes by using a route search; identifying the target road section on the digital map; and specifying an event occurring position within the target road section based on the event information; wherein the road shape information includes coordinate data of the selected nodes and designates the target road section, wherein the event information designates an event occurring position by using a relative position within target road section, wherein the steps of intermittently selecting nodes and transmitting road shape information are executed at a transmitting side, and wherein the steps of executing a map matching, determining positions, obtaining a road, identifying the target road section, and specifying an event occurring position are executed at a receiving side.