To easily and quickly attain the copy of a hard disk.

An operating system to be copied to a hard disk 84 at the destination of copy set in a personal computer is recorded in a hard disk 81 with a large capacity at the origin of copy. Setting (for example, a recording capacity) corresponding to the device information of the had disk 84 at the destination of copy is completed in this operating system. When the hard disk 84 at the destination of copy is designated by a designating means 83, the operating system in which the device information of the hard disk 84 at the destination of copy is set is selected by a reading means 82, and copied to each hard disk 84 at the designation of copy.