A short-range wireless communication device, comprising: a second Near Field Communication, NFC, unit configured to: transmit a link key request message requesting a link key used for establishing a Bluetooth, BT, connection with a portable terminal, to the portable terminal when the second NFC unit is connected to a first NFC unit of the portable terminal by NFC while the short-range wireless communication device is powered off, receive a link key confirm message from the portable terminal in response to the link key request message, power on the short-range wireless communication device upon receipt of the link key confirm message, determine whether the link key is received in the link key confirmation message, if the link key is not received in the link key confirm message, establish a BT connection with the portable terminal by out of band, OOB, pairing, if the link key is received in the link key confirm message, compare the received link key with one or more pre-stored link keys, and transmit a connection request message if the received link key is identical to any of the pre-stored link keys to establish a BT connection with the portable terminal using the pre-stored link key, wherein the link key is generated and stored in memory units of the short-range wireless communication device and the portable terminal when the short-range wireless communication device and the portable terminal are paired with each other. a second Near Field Communication, NFC, unit configured to: transmit a link key request message requesting a link key used for establishing a Bluetooth, BT, connection with a portable terminal, to the portable terminal when the second NFC unit is connected to a first NFC unit of the portable terminal by NFC while the short-range wireless communication device is powered off, receive a link key confirm message from the portable terminal in response to the link key request message, power on the short-range wireless communication device upon receipt of the link key confirm message, determine whether the link key is received in the link key confirmation message, if the link key is not received in the link key confirm message, establish a BT connection with the portable terminal by out of band, OOB, pairing, if the link key is received in the link key confirm message, compare the received link key with one or more pre-stored link keys, and transmit a connection request message if the received link key is identical to any of the pre-stored link keys to establish a BT connection with the portable terminal using the pre-stored link key, transmit a link key request message requesting a link key used for establishing a Bluetooth, BT, connection with a portable terminal, to the portable terminal when the second NFC unit is connected to a first NFC unit of the portable terminal by NFC while the short-range wireless communication device is powered off, receive a link key confirm message from the portable terminal in response to the link key request message, power on the short-range wireless communication device upon receipt of the link key confirm message, determine whether the link key is received in the link key confirmation message, if the link key is not received in the link key confirm message, establish a BT connection with the portable terminal by out of band, OOB, pairing, if the link key is received in the link key confirm message, compare the received link key with one or more pre-stored link keys, and transmit a connection request message if the received link key is identical to any of the pre-stored link keys to establish a BT connection with the portable terminal using the pre-stored link key, wherein the link key is generated and stored in memory units of the short-range wireless communication device and the portable terminal when the short-range wireless communication device and the portable terminal are paired with each other.