A printing system performing marginless printing. The system includes a host device operable to send image data, and a recording device performs marginless recording based on the image data received from the host device. The system includes a setting unit setting the width of the recording medium, a changing unit changing scaling ratio of the image data based on the width of the recording medium. Furthermore the system includes a recording unit recording the image on the recording medium based on the image data with the changed scaling ratio. An image is enlarged/reduced to the width of the roll paper sheet, thereby loss portions in the longitudinal direction are controlled to a minimum.