Method for updating rom bios

PURPOSE: A method for updating a ROM BIOS is provided to update image data of the ROM BIOS corresponding to user information and to display the image data which is updated when executing POST(power on self test). CONSTITUTION: ROM BIOS image data are read from a ROM BIOS(S103). New ROM BIOS image data are read from an auxiliary memory unit and load to a system memory(S105). A checksum of the new ROM BIOS image data is checked(S107). It is judged whether the checksum is accurate(S109). In case that the checksum is accurate, a system ID of the new ROM BIOS image data is checked. It is judged whether the system ID is identical to a system ID checked from ROM BIOS image data to be updated(S111). New user information inputted from a user using a keyboard is read(S113). It is judged whether all the user information is read(S115). The new user information is converted into image data and stored in a user information area(S117). Image data of the user information are converted into the image data on the new user information(S119). The new checksum is stored in the ROM BIOS(S121). The new ROM BIOS image data and the image data relevant to the new user information are updated in the ROM BIOS(S123).