PROBLEM TO BE SOLVED: To provide a system in which the action of a class library can be easily changed by a user and the expandibility of the class library is improved. ;SOLUTION: With respect to classes 20-40 defined in a class library 10, these classes 20-40 are respectively succeeded and skelton classes 60-80, with which the user can arbitrarily define members, are provided in advance. When generating the instance of the class 30, a class 50 defined in the class library 10 is constituted so as to generate the instance of the skelton class 70 succeeding this class 30.;COPYRIGHT: (C)1999,JPO
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