According to the embodiment, an image forming apparatus includes an image forming unit, a writing unit, and a processor. The processor controls image-formation by the image forming unit to form a first image on a first sheet. The processor suspends image-formation of a second image, the second image being next to the first image, until the processor recognizes whether the writing unit succeeds in or does not succeed in writing the information in the wireless tag of the first sheet, on which the first image is formed.