Further comprising: broadcasting a neighbor node direction determined sector-based method for a node in a vehicle ad-hoc network system according to the invention, by inserting the own position information and traveling direction information to the emergency message; If the emergency message is received, it is dividing the space into a straight line having a slope of a certain size interval centered on a vehicle transmitting the emergency message to a plurality of sectors and their position in the position corresponding to the position information included in the emergency message detecting a sector belonging to the slope of the line indicates the position according to the information; If the sector corresponding to the direction information included in the emergency message, the method comprising processing the emergency message and broadcast to the neighboring node; If the sector not corresponding to the direction information included in the emergency message, the method comprising: deleting the urgent message; it characterized in that it comprises a.