An image generation apparatus stores a plurality of selection condition rows including a plurality of selection conditions used for selecting an image from a plurality of material images, selects at least one material image from the plurality of material images as a first material image, obtains a feature quantity of the first material image, selects a selection condition row which is stored in the storage unit and includes a selection condition including the obtained feature quantity, selects a second material image from the plurality of material images based on a selection condition row which has been selected, and generates an image based on the first and the second material images which have been selected and the selection condition row which has been selected.