Abstract: An apparatus and a method for storing a BIOS data of a computer system are disclosed. The apparatus includes a first storing apparatus for performing a function as a memory and a function as a storing apparatus for storing a BIOS data therein, a second storing apparatus in which a BIOS data stored in the first storing apparatus is copied and stored therein, a CPU(Central Processing Unit) for accessing a BIOS data stored in the first storing apparatus and driving a computer system when an electric power is supplied to the computer system, a main power controlling for supplying or blocking a main power, a controller for controlling each element of the system, and a system power unit for applying a system power to the first storing apparatus and the controller, respectively, for thereby significantly decreasing the fabrication cost of the system by storing a BIOS data into a SDRAM used as a cache memory of the computer system.