PROBLEM TO BE SOLVED: To provide a server or the like for improving the value of using information on the fuel economy of a vehicle.;SOLUTION: A fuel economy information management server 100 notifies a driver or a third person of time-series transition of fuel economy as well as eco-index for the same vehicle or a vehicle driven by the same driver through eco information. The eco-index is the result of converting a travel state factor as a fuel economy fluctuation factor when the fuel economy is achieved.;COPYRIGHT: (C)2011,JPO&INPIT
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