1. An image layout apparatus comprising: image decision means for deciding a plurality of images selected to be laid out on one background image; region decision means for judging presence of at least one face in each of the plurality of selected images and for deciding a representative face of a plurality of faces with respect to an image that has been judged to include the at least one face, and that includes faces the number of which is greater than or equal to 2 and less than or equal to a predetermined number and for judging whether a distance between a center of the representative face and a center of a face other than the representative face is less than or equal to a predetermined number of times wider than the width of the representative face and for deciding, as a display region, a region including all of the faces if the judgment about the distance is YES and for deciding, as the display region, a whole area of the image if the judgment about the distance is NO; and layout image generation means for extracting the decided display region from the plurality of selected images respectively and for generating a layout image by laying out the plurality of extracted display regions on the background image.