The eco-drive assist apparatus 1 shows a degree of eco of a driving operation of a vehicle by displaying a relative state to a judgment threshold value that fluctuates based on a driving state of the vehicle, the eco-drive assist apparatus, and includes a power train ECU 10 that calculates the judgment threshold value and a state quantity of eco-drive indicating a ratio to the judgment threshold value based on the driving state of the vehicle; and a meter ECU 20 that executes a display based on information transmitted from the eco-drive assist information generating apparatus, the power train ECU 10 transmitting the state quantity of eco-drive to the meter ECU 20.
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