<P>PROBLEM TO BE SOLVED: To provide an ecological driving system capable of making a user sufficiently conscious about global environment-friendly driving. <P>SOLUTION: In the ecological driving system 1, a CPU 2 allows a display apparatus 11 to distinctively the display fuel consumption according to the following idling states: an idling state attributable to the engine warm-up; a wasteful idling state, an idling state attributable to the vehicle waiting for turning to the left at an intersection or the stopping at a roadside; an idling state attributable to the vehicle waiting for turning to the right at an intersection; and an idling state attributable to the vehicle waiting forward at an intersection or the stopping due to traffic congestion. <P>COPYRIGHT: (C)2007,JPO&INPIT 
ECOLOGICAL DRIVING SYSTEM