1. A driving support system for supporting a user who is driving a vehicle, the system comprising: a physical condition measuring unit for measuring a physical condition of the user and for generating a condition data at an outside of a vehicle; and an information processor disposed on the vehicle for (a) receiving the condition data from the physical condition measuring unit through a power line that connects a battery in the vehicle and a power supply unit outside the vehicle for charging the battery, and for (b) providing an advice for driving operation at a timing that takes into consideration the physical condition of the user estimated from the condition data after (c) examining if the user is performing a fuel-consumption-conscious driving operation and (d) determining that the user is not performing the fuel-consumption-conscious driving operation (e) based on a vehicle condition reflecting driving operation of the user derived from sensors in the vehicle when the user is driving the vehicle.