IMAGE PROCESSING APPARATUS CAPABLE OF PERFORMING PRINTING WITH DECOLORING TONER, METHOD OF CONTROLLING IMAGE PROCESSING APPARATUS, AND STORAGE MEDIUM

An image processing apparatus that is capable of performing image formation on recording sheets, by switchingly using decoloring toner and normal toner. The number of sheets printed with the decoloring toner and the number of sheets printed with the normal toner are counted with respect to the recording sheets on a user-by-user basis. A use ratio of a logged-in user who has logged in the image processing apparatus is acquired, which indicates a ratio of the number of sheets printed with the decoloring toner to a total number of the number of sheets printed with the decoloring toner and the number of sheets printed with the normal toner based on the count. In a case where the use ratio is equal to or lower than a first threshold value, a notification for recommending printing using the decoloring toner is provided to the logged-in user.