1. A printing apparatus, comprising: a halftone unit that performs a halftone process in which the possibility of dot formation is determined for each pixel based on a dot occurrence rate of the pixel constituting image data; and a printing unit that forms dots on a recording medium based on the possibility of the dot formation, wherein the halftone unit predicts dot overlap in which a plurality of dots overlap on the recording medium, and performs the halftone process based on an evaluation index which is in accordance with the dot overlap.