Abstract: An image forming device, a host device connected to the image forming device and controlling methods thereof. The image forming device includes a memory to store information regarding remaining recording material stored in a recording material storage medium, an image generator to generate at least one of a preview image of a document based on the remaining recording material and a color table image to display colors available in the image forming device based on the remaining recording material, and a controller to control the image generator to generate the at least one of the preview image and the color table image and to display the at least one of the preview image and the color table image on a web browser if an estimate of an amount of recording material to be consumed to print the document is greater than the remaining recording material. Accordingly, a user can prevent unwanted prints.