When reading image data stored on a detachable storage medium such as a magneto-optical disk and outputting the data using an image outputting device, data regarding modes in which the image data is to be output is stored in advance on a storage medium by an apparatus such as a personal computer, for example, which is different from the image outputting device. By loading the storage medium in the image outputting apparatus, the image data is read out and output in accordance with the stored output mode data, whereby it is possible to prevent the image outputting apparatus from being monopolized for a long period of time and to output data easily in a desired output mode.