US 3427408 A description reference will now be made in detail to the embodiments examples of which are illustrated in the accompanying drawings wherein like reference numerals refer to the like elements throughout the embodiments are described below to explain the present invention by referring to the figures fig2 is a view of a notebook personal computer pc according to an embodiment of the present invention the personal computer contains a processor a memory etc and including other component s of computer the personal computer shown in fig2 includes a keyboard 210 a display 220 and so on as input output devices receiving and or transmitting information from or to a user the processor performs a process in accordance with instruction s from software loaded into the memory although fig2 is described by referring to specific component s of a personal computer the present invention may be implemented on any machine or device fig3 is a diagram showing the software configuration of the notebook personal computer shown in fig2 in fig3 reference numeral 310 denotes an administrative host os a second os reference numeral 320 denotes a virtual machine performed as one process on the administrative host os 310 and reference numeral 330 denotes a working guest os a first os executed on the virtual machine 320.