Apparatus and method for controlling clock signal for multi-interface card between smart card and memory card

Authentication function, and multi-media interface card clock control unit for performing a data storage function includes signal detection unit, the clock mode detector and a clock signal generating portion. Signal detection unit detects the smart card host and the at least one memory card host, each of the power supply voltage and each of the clock signals having different clock rates and the smart card. Clock mode detector is based on a smart card host and the memory of each of the power supply voltage and each of the clock signal of the card host clock to generate the mode signal showing the predetermined clock mode. Clock signal generating portion provided in the interface block, and system for processing both the interface and the memory card host and the smart card by the host based on a clock signal generating mode for low-speed clock signal or a high-speed clock signal. Can each other to reduce the power consumption of the smart card host clock and the memory card interface card system by monitoring the clock of the host, based on a predetermined clock operation mode, convert the clock rate of the system clock at a low speed or a high speed with a different clock speed, have.