1. An album creating apparatus for creating an album having pages, comprising: a non-transitory storage medium having an image storing section for storing a plurality of images correlating with image capturing-times of the images; and a microprocessor coupled to the storage medium and configured to function as: a distribution-of-image-capturing-time calculating section for calculating a distribution of image capturing-times of the plurality of images stored in said image storing section based on the image capturing-times of the plurality of images stored in said image storing section; an image sorting section for sorting the plurality of images stored in said image storing section per page in the album based on the distribution of image capturing-times calculated by said distribution-of-image-capturing-time calculating section; a layout determining section for laying out the images sorted by said image sorting section per page to each page of the album; a main image selecting section for selecting a main image that is to be a primary image in each page of the album at the time the album is created out of the images sorted into said each page by said image sorting section; and a subsidiary image selecting section for selecting subsidiary images that are to be images subsidiary to the main image selected by said main image selecting section in each page of the album out of the plurality of images stored in said image storing section based on the contents of the main image selected by said main image selecting section; wherein said layout determining section lays out the main image selected by said main image selecting section and the subsidiary images selected by said subsidiary image selecting section in the same page in the album based on contents of the main image selected by said main image selecting section and the subsidiary images selected by said subsidiary image selecting section, wherein the microprocessor is further configured to function as: a similarity calculating section for calculating similarity of the main image with each of other sorted images in the same page of the album as the main image, wherein said subsidiary image selecting section selects the subsidiary images according to the similarity with the main image selected by said main image selecting section, and said similarity calculating section calculates the similarity according to a time difference from an image capturing-time of the main image selected by said main image selecting section, wherein the similarity is calculated according to a time difference between an image capturing-time of the main image and an image capturing-time of each of an other plurality of images sorted in the same page as the main image, and the subsidiary images are selected according to the similarity of the main image with each of the other plurality of images, and from said plurality of images sorted in the same page as the main image, only said subsidiary images selected according to the similarity with the main image, are selected by said subsidiary image selecting section to be laid out in said same page together with the main image, by said layout determining section.