A connection establishment method, performed by an electric vehicle, EV, being supplied power from a power supply device, the connection establishment method comprising: scanning beacon broadcast in a low-level communication scheme from a plurality of chargers when the EV enters a charging station including a plurality of power supply devices and a plurality of electric vehicle supply equipments, EVSEs, configured to manage the plurality of power supply devices, wherein each of the plurality of power supply devices includes a primary coil providing wireless power transfer, WPT to the EV and a sensor broadcasting a beacon signal; selecting a beacon signal having a minimum signal attenuation by calculating signal attenuations for a plurality of scanned beacon signals from the plurality of power supply devices, wherein the beacon signal having the minimum signal attenuation includes information indicating a first charger that manages a first power supply device transmitting the beacon signal; establishing a communication connection with a first electric vehicle supply equipment, EVSE, associated with the first charger; disconnecting the communication connection with the first EVSE when another beacon signal having a signal attenuation which becomes the smallest is detected by repeatedly calculating the signal attenuation for a plurality of scanned beacon signals from the plurality of power supply devices until a position alignment between a transmission pad of the first power supply device of the first charger and a reception pad of the EV is completed based on a magnetic vectoring or a low frequency antenna for the low-level communication scheme; and establishing automatically a communication connection with a second EVSE associated with a second charger transmitting the another beacon signal based on information included in the another beacon signal after the disconnecting. scanning beacon broadcast in a low-level communication scheme from a plurality of chargers when the EV enters a charging station including a plurality of power supply devices and a plurality of electric vehicle supply equipments, EVSEs, configured to manage the plurality of power supply devices, wherein each of the plurality of power supply devices includes a primary coil providing wireless power transfer, WPT to the EV and a sensor broadcasting a beacon signal; selecting a beacon signal having a minimum signal attenuation by calculating signal attenuations for a plurality of scanned beacon signals from the plurality of power supply devices, wherein the beacon signal having the minimum signal attenuation includes information indicating a first charger that manages a first power supply device transmitting the beacon signal; establishing a communication connection with a first electric vehicle supply equipment, EVSE, associated with the first charger; disconnecting the communication connection with the first EVSE when another beacon signal having a signal attenuation which becomes the smallest is detected by repeatedly calculating the signal attenuation for a plurality of scanned beacon signals from the plurality of power supply devices until a position alignment between a transmission pad of the first power supply device of the first charger and a reception pad of the EV is completed based on a magnetic vectoring or a low frequency antenna for the low-level communication scheme; and establishing automatically a communication connection with a second EVSE associated with a second charger transmitting the another beacon signal based on information included in the another beacon signal after the disconnecting.