An information processor includes an image data generating circuitry and a communicator. The image data generating circuitry includes a logical page generating circuitry and a page adjusting circuitry, and generates image data. The logical page generating circuitry generates a plurality of logical pages each containing a plurality of pages. The page adjusting circuitry adjusts number of pages of the plurality of pages contained in a first logical page of the plurality of logical pages. The image data contains the plurality of logical pages. The communicator transmits the image data to an image forming unit. The image forming unit is able to cut a recording medium by using the logical pages as a reference, and forms an image on the recording medium by using the logical pages as a reference.