A system must have a model of human behaviors to work considering them. Therefore, we have proposed a modeling method of human behaviors based on the relationship between the change of human behaviors and the situation around a person. As an example, human driving behaviors are modeled by the proposed modeling method, and a driving support system to present a next action and its timing to a driver is constructed in this research. In order to realize the support system, we propose an estimation method of a human next action and its timing based on the proposed model. The usefulness of the human behavior support is examined.