A BIOS architecture adapted in a computer system is provided. The BIOS architecture includes at least one BIOS, a programmable chip module, a baseboard management controller (BMC), a south bridge chip and a network interface controller (NIC). The NIC is connected to the south bridge chip and the BMC and is to receive a remote update data to determine the destination of the remote update data. When the destination of the remote update data is the south bridge chip, the south bridge chip updates the BIOS according to the remote update data. When the destination of the remote update data is the BMC, the NIC informs the BMC to receive the remote update data, such that the BMC controls the programmable chip module to update the BIOS according to the remote update data.