PURPOSE: To easily use an object described in an object-oriented language by another object described in another object-oriented language with respect to the method for realizing the interface between plural different object-oriented languages in a computer system.

CONSTITUTION: Objects described in different object-oriented languages are operated on processes 10 and 11 different from each other, and they communicate with each other by interprocess communication dependent upon a communication manager 16. A virtual server class 13 corresponding to a class 12 on the server side is prepared on the client side, and the start of the method of the virtual server class 13 is transmitted to the corresponding object on the server side through the communication manager 16.