PURPOSE:To remove the fault of correcting an application program when the system of a graphics library or a window constitution is different, and to facilitate a counter measure to any situation, at the time of constituting a display screen at the application program by using the graphics library in a work station or the like. CONSTITUTION:Two interfaces 1 or 2 are interposed among graphics libraries 11a and 11b, and an application program 12. First interfaces 13a and 13b unify the difference of a window preparing form due to the library to a standard form. second interfaces 14a and 14b combine the plural windows in order to handle them as one window.
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