PURPOSE: To ensure an optional selective connection for a remote terminal to plural virtual computers, by providing a communication connecting means which is common with plural virtual computers.

CONSTITUTION: A circuit control program ANCP is set under the control of a communication controller 2, and this controller 2 plus the terminals 31a, 31b and 31c which are under the control of the controller 2 are all put under the control of a virtual computer system 1. The communication between the above-mentioned remote terminals and a host processor (the system 1 and the controller 2) is carried out by decoding an instruction through the program ANCP or a communication connecting means AVTAM.