Patent ID: 8166417

Claim:
A display control apparatus for controlling a display on a screen of a display unit, comprising: a piece of hardware, including a programmable processor; a discrimination unit configured to discriminate a designated position, by a positioning operation using an input pen, on the screen of the display unit; an issue unit configured to determine a window containing the designated position discriminated by said discrimination unit and to issue coordinates data indicating the designated position on the window; a first determination unit configured to determine whether or not a continuous positioning operation using the input pen is being performed in a first window, wherein said first determination unit determines that the continuous positioning operation is being performed when a positioning operation using the input pen is performed within a preset time period after the last positioning operation using the input pen, and determines that the continuous positioning operation has ended if no positioning operation is performed in the preset time period or if the distance between the latest pen-up position of the input pen and the current designated position by the input pen is larger than a preset value; a second determination unit configured to determine, in a case where said first determination unit determines that the continuous positioning operation is being performed in the first window, whether or not the designated position discriminated by said discrimination unit is located within a second window that is displayed to cover a part of the first window; a display change unit configured to make the second window transparent in a case where said second determination unit determines that the designated position discriminated by said discrimination unit is located within the second window; and a coordinates output unit configured to output, to the first window, coordinates data indicating the designated position discriminated by said discrimination unit in the second window that is made transparent by said display change unit, as long as said first determination unit determines that the continuous positioning operation is being performed, wherein said programmable processor functions as at least one of said discrimination unit, said first and second determination units, said display change unit and said coordinates output unit.