A computer system includes an ACPI (Advanced Configuration and Power Interface) that abstracts HWs (hardwares) as objects arranged on an ACPI tree which is a virtual space, an OS (Operating System) that recognizes a configuration of the HW through the ACPI, a virtual HW provided between the ACPI and HW and includes a memory area in which locations storing information for each HW are arranged in the same arrangement as the objects on the ACPI tree, and a BIOS (Basic Input/Output System) that previously refers to the HW and stores information for each HW in the memory area of the virtual HW at a location corresponding to the HW. The ACPI refers not directly to the HW but to the memory area of the virtual HW to obtain information for each HW, thereby allowing the OS to recognize the HW configuration from the information for each HW.