PROBLEM TO BE SOLVED: To facilitate finding a page in which an image is changed after text input.;SOLUTION: A CPU 106 sets an image and text corresponding to the image in page units according to a user operation, and stores date and time set for each of the image and the text as set date and time in page units. The CPU compares the set date and time of the image with the set date and time of the text in page units, and displays a page having a comparison result satisfying a predetermined condition on a display part 101.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2019,JPO&INPIT
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