a cumulative power amount control unit for charging the storage cell with electric power till the cumulative power amount reaches a first threshold if the accepted drive schedule data represents the vehicle is to be used during the period, or otherwise, charging the storage cell with electric power till the cumulative power amount reaches a second threshold lower than the first threshold if {HEAD ~ the accepted drive schedule data} represents {TAIL ~ the vehicle} is not to be used during the period 
represents
a cumulative power amount control unit for charging the storage cell with electric power till the cumulative power amount reaches a first threshold if the accepted drive schedule data represents the vehicle is to be used during the period , or otherwise , charging the storage cell with electric power till the cumulative power amount reaches a second threshold lower than the first threshold if { HEAD ~ the accepted drive schedule data } represents { TAIL ~ the vehicle } is not to be used during the period
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