A vehicle non-use state recognition unit recognizes that an electric vehicle 1 is in non-use state. A battery remaining amount recognition unit recognizes a remaining amount of a battery loaded into the electric vehicle. A battery maintenance request unit transmits, when the vehicle non-use state recognition unit recognizes that the electric vehicle is in non-use state, remaining amount recovery request information for requesting to recover the remaining amount of the battery to a maintenance server which receives a maintenance of the battery when the battery remaining amount recognition unit recognizes that the remaining amount of the battery is a first predetermined value or less.
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