1. An image forming apparatus comprising: an acquisition unit configured to acquire a drawing object included in a page; a determination unit configured to determine a threshold value, the threshold value being a first threshold value in a case where the acquired drawing object overlaps another drawing object included in the page or a second threshold value in a case where the acquired drawing object does not overlap another drawing object included in the page; a selection unit configured to select, as a drawing method, one of a mask drawing and an edge drawing to draw the drawing object using the determined threshold value; and a drawing unit configured to draw the acquired drawing object by the selected drawing method; wherein the mask drawing tends to be selected by using the second threshold value more than the first threshold value.