Default image data and subject image data are stored separately in nonvolatile memory and when the subject image data stored in the nonvolatile memory is displayed in a standard playback mode, the subject image data is displayed on an LCD at a specific scaling factor (first scaling factor) determined by the image size of the subject image data regardless of whether or not default image data is set for the subject image data. On the other hand, when composite image data is displayed in a print preview mode, scaling processing to display the subject image data on the LCD at a smaller scaling factor than the first scaling factor is performed so that the whole of the composite image data can be displayed on one screen of the display.