| 摘要 |
PURPOSE: A credit card payment device using an audio jack of an electronic device is provided to transmit credit card information, which is inputted through the audio jack, to a payment server and to perform payment, thereby performing safe payment. CONSTITUTION: A credit card(10) comprises an audio terminal, a MIC(microphone) terminal, and a smart card chip(110). The audio terminal or the MIC terminal is an input and output terminal for transmitting and receiving information with an electronic device(30). The smart card chip includes an audio converter unit which converts signals inputted and outputted through the audio terminal and the MIC terminal. An interface(20) comprises an audio terminal pad, an MIC terminal pad, and a plug connected to an audio jack(310) of the electronic device. The interface physically connects the credit card and the electronic device. The electronic device transmits credit card information inputted through the interface to a payment server.
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