A collage image creating method includes a first step that creates a collage image by determining arrangements of the plurality of images according to a placement algorithm including a rotation angle of each image as a parameter; and a second step that recreates a collage image by re-executing the first step to at least one of a change due to an addition or deletion of an image which configure the collage image, a change in arrangement position of at least one image among images which are included in the collage image, a change in rotation angle of at least one image among images which are included in the collage image, and a change in arrangement size of at least one image among images which are included in the collage image.
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