To display the whole slave window even when the size of a master window is changed.

A master window size correction means 3 corrects the size of the master window to a size which can display the slave window when the size of the master window after size change is smaller than the size of the slave window. A window position calculation means 4 calculates the transfer position of the slave window after the size change of the master window. Then, the relative positions of the coordinate systems of the master window and the slave window are converted on the basis of the transfer position of the slave window calculated by the window position calculation means 4, and the slave window is displayed on the converted relative position.

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