To enhance visibility and operability of a user by reducing windows displayed by extending over a plurality of displays to the minimum in a multi-display.

In a display controller of the windows in displaying the windows on display surfaces HG1, 2 formed by the plurality of displays 12, 13 connected to a computer, it is constituted by providing: a first detection means for detecting the size of the windows to be displayed; a second detection means for detecting arrangement of the windows to be displayed on display surfaces of the plurality of displays; a judgment means for judging whether the windows to be displayed are transferred based on the detection results of the first detection means and the second detection means; and a window transfer instruction means for issuing an instruction so as to rearrange the windows in a display screen of one of the displays when the judgment means judges that the windows are transferred.

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