SECURE BOOT METHOD

PROBLEM TO BE SOLVED: To solve the problem in which there is possibility of reliability deterioration of secure boot due to alteration in an initialization code 1006 or a virtual computer code 1012 by a hacker etc. with malicious intent, in the conventional configuration.SOLUTION: A virtual computer code 1012 is attained by virtual computer hardware 1008 and a virtual computer control code 1009, and an initialization code 1006 or the virtual computer control code 1009 is preliminarily encrypted and stored in a storage device 1004. Intended alteration by a malicious hacker becomes difficult by setting a secure area of RAM 1003 and decrypting the initialization code 1006 or the virtual computer control code 1009 to load it to the secure area of the RAM 1003 in a sequence of secure boot.