We propose a new safe driving support system for car drivers. The proposed method firstly sets up plural sensors inside a car and on a driver's body. These sensors detect the movements and environmental situation of the car, and the driver's vital sign. Next, the system totally analyzes the corrected data and immediately predicts any risks to cause traffic accidents. Then, the system alerts the possible risk to a driver for promoting careful driving and avoiding any accidents. Additionally, the system accumulates and analyzes data acquired from these sensors and gets a new knowledge model for safe driving. We describe the proposed system design, the implementation method, and the preliminary evaluation in this paper.