From a moving image selected by a user, moving image information including a time length of the moving image and the number of change points of clips in the moving image is acquired. Layout data showing a design (the number, size, layout and the like of plural frame images configuring moving image) of a still image to be generated is selectively read from a memory based on the acquired moving image information. A still image in which predetermined frame images are arranged based on the layout data is generated and output. The predetermined frame images are automatically set in accordance with setting rules that are different depending on whether or not there is data concerning a highlight frame whose size is larger than that of other frame images in the layout data. The highlight frame may be also designated.