PURPOSE:To reduce time for giving and taking the control to and from a virtual computer, by limiting a transfer of address conversion information of the first address conversion buffer, to only the point of time when giving the control to other virtual computer immediately before transferring. CONSTITUTION:A computer identifier 83 of a virtual computer and a computer identifier 71 of a computer identifier holding means 70 are compared by a comparing means 90. In case of dissidence, a signal 91 is sent to an address conversion information transfer means. The address conversion information transfer means read out the identifier from the identifier holding means 70, and saves address conversion information of an address conversion buffer in an area decided in advance for its discriminating virtual computer. Subsequently, for the virtual computer discriminated by the identifier 83, the address conversion information saved in the area decided in advance is stored in the address conversion buffer. Subseqently, the identifier 83 of the virtual computer which obtains control is held by the computer identifier holding means 70.
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