determines that the approach route of vehicle 150 approaching power supply section 143 is wrong when power supply efficiency change amount y per unit moving distance input from change amount calculation section 105 is less than the lower limit value of the power supply efficiency change amount of the table stored in storage section 106 then vehicle side control section 107 displays guidance for correcting the approach route on display section 108 when it is determined that the approach route is wrong meanwhile vehicle side control section 107 determines that the approach route is correct when power supply efficiency change amount u03b4k is greater than 0 and power supply efficiency change amount y per unit moving distance is equal to or greater than the lower limit value then vehicle side control section 107 displays a message that the approach route is correct on display section 108 when it is determined that the approach route is correct furthermore vehicle side control section 107 may perform a control so that the message is displayed only when the approach route is wrong without displaying the message when the approach route is correct vehicle side control section 107 determines whether it is a brake stepping timing based on the power supply efficiency received from power supply efficiency.