1. An image processing apparatus, comprising: an enlargement ratio setting section which sets a region of data in an original image, including a designated position designated as an object to be enlarged within the original image, as a region to be enlarged, and sets an enlargement ratio to the region to be enlarged, based on an image feature amount showing complexity of an image of the region to be enlarged; and an enlarged image generation section which generates enlarged image data for the data of the original image, by applying an enlargement process by the enlargement ratio set by the enlargement ratio setting section.