To surely grasp necessary traffic information.

A road traffic information notification system 1 consists of a broadcasting station 2 which broadcasts road traffic information that a specific speaker speaks in stereotyped expression and an on-vehicle notification device 3 which receives the broadcast and notifies a driver of the road traffic information. The notification device 3 receives the broadcast and recognizes the voice by a voice recognition device 20, then extracts information on both the traffic state and object place included in the road traffic information, and judges whether or not the information on the traffic state is necessary for its vehicle according to the relation among the position of the object place and the current position and travel direction of its vehicle, thereby synthesizing and outputting a voice of the necessary traffic state information together with the information on the object place. The voice recognition device 20 previously stores the voice pattern corresponding to the specific speaker and recognizes the voice of the specific speaker.