A computer system includes: storing a first file management table that stores a record associating a device driver that can be installed in the computer system with identification information of a logic area in which the particular device driver is stored; reading a second file management table stored in a recording medium placed in the drive, generating a third table by inserting the record in the first management table into the second management table, and generating a virtual file management table that associates the third table with the device driver stored in the first table as well as the device driver stored in the second table, and searching for the device driver requested, install the requested device driver.