A collision accident prevention method, apparatus, server, and computer program are proposed. The method can include predicting, based on data on a three-dimensional (3D) space corresponding to a caution zone, motion of each of at least one pedestrian in the caution zone and at least one vehicle in the caution zone. The method may also include determining, based on the predicted motion, a degree of risk of collision between the at least one pedestrian and the at least one vehicle. The method may further include providing a message corresponding to the determined degree of risk of collision to the at least one vehicle.