Patent ID: 8265553

Claim:
An external device for a mobile communication terminal, said external device comprising: a serial communication unit connectable to the mobile communication terminal through a connector; an antenna; a Near Field Communication (NFC) unit for communicating with the mobile communication terminal through the serial communication unit and communicating with an outside device via non-contact NFC through the antenna; a smart card unit for communicating with the NFC unit; a Universal Serial Bus (USB) communication unit, other than the serial communication unit; and a protocol matching unit coupled between the NFC unit and the smart card unit; wherein the external device is configured to detect whether the external device is connected to one of (i) the mobile communication terminal through the connector of the serial communication unit, and (ii) to a USB host device via the USB communication unit; the NFC unit is configured to, in response to a determination that the external device is connected to the mobile communication terminal, communicate with the mobile communication terminal via a serial communication protocol, communicate with the outside device by transmitting/receiving signals through the antenna via non-contact NFC, and communicate with the smart card unit, wherein the protocol matching unit is configured to perform protocol conversion between the NFC unit and the smart card unit; and the external device is configured to, in response to a determination that the external device is connected to the USB host device, serve as a USB slave and communicate with the USB host device via a USB interface.