A computer is made usable in a short time using a fingerprint authentication device. When a fingerprint authentication device performs authentication successfully, the fingerprint authentication device sends a startup signal to a power controller via a line. The power controller controls a DC/DC converter to supply power to devices. The fingerprint authentication device sets whether normal boot or fast boot that is completed in a shorter time than the normal boot is successful, in a register via a line. In the fast boot, initialization of a USB interface of a line and password input by a user are skipped, and a BIOS accesses a system by single sign-on using a password stored in a secure area.