PROBLEM TO BE SOLVED: To improve operability of a device which outputs an image according to document data.SOLUTION: Multiple pieces of document data are sequenced, and each of the multiple pieces of document data is stored in a state in which they are classified into each multiple attributes. An image based on one piece of document data is output by output means, and then an image based on next document data is output by the output means (Fig.5(b)). Moreover, an image based on a specific attribute constituting one piece of document data is output by the output means, and then a next image is output by the output means on the basis of the attribute (Fig.5(a), (c)). In other words, two methods are employed as a display method of an image, which are a method of displaying an image according to each piece of document data, and a method of displaying an image according to each attribute. Thereby, a user can select an arbitrary method from the two methods, and operability of a device is improved.
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