Abstract: The window display control system comprises a display unit capable of displaying a plurality of windows and a plurality of input devices for data input. It further comprises a data distinction unit which checks the data input from the input devices to distinguish the data to select one of the plurality of windows or to cancel a selected window from other input data, a window selection unit which, when the data distinguished by the data distinction unit is for window selection or cancellation, establishes or cancels correspondence between the applicable input device and the applicable window, and a display control unit which, when the data distinguished by the data distinction unit is the input data other than those for window selection or cancellation, sends the data for display in the window having correspondence with the applicable input device according to the instruction from the window selection unit.