1. A method of controlling an apparatus which is capable of determining a dot disposition of a copy-forgery-inhibited pattern image, that has a latent image area in which a plurality of first dots and a plurality of second dots smaller than the first dots which can be reproduced when copied are disposed, and a background area in which a plurality of the second dots are disposed, the method comprising: displaying information related to a disposition of the first dots in the latent image area and a disposition of the second dots in the latent image area; setting a rate of the first dots that are disposed in the latent image area, or a rate of the second dots that are disposed in the latent image area, in accordance with a designation performed by a user; and determining the dot disposition in the latent image area in accordance with the setting of the rate.