Provided is a smart card for communicating with a host computer through a universal serial bus (USB). The smart card includes an internal clock signal generator to generate an internal clock signal, a period detector to detect a period of the internal clock signal and to generate a control code according to the detected period, and a transmission clock generator to generate a transmission clock signal which varies from the internal clock signal according to the control code. The smart card transfers data in sync with the transmission clock signal.

 
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> Method to display a mark-up document according to a parental level, method and apparatus to reproduce the mark-up document in an interactive mode, and a data storage medium therefor

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