A processing control apparatus controls mask processing for an image sensed by an image sensing unit with a variable image sensing position. A storage unit stores a mask setting. A control unit controls the image sensing unit. An obtaining unit obtains, from the control unit, exposure time information representing a progression of exposure by the image sensing unit, and obtains an image sensing position of the image sensing unit. A determination unit determines whether the exposure time information reaches a predetermined value, and determines a position on the image to which the mask processing is performed, based on (i) the image sensing position of the image sensing unit obtained by the obtaining unit and (ii) the mask setting, when the exposure time information reaches the predetermined value.