1. An image displaying apparatus, comprising: image acquiring means for acquiring a plurality of images; image feature quantity calculating means for calculating values of image feature quantities of a plurality of types for each of the images acquired by the image acquiring means; first image position coordinate calculating means for calculating the position coordinates of each of the images in a first space, the first space having coordinate axes corresponding to each of the image feature quantities, based on the values calculated by the image feature quantity calculating means; feature direction calculating means for calculating one or a plurality of feature directions in the first space, based on the position coordinates calculated by the first image position coordinate calculating means; second image position coordinate calculating means for calculating the position coordinates of each of the images acquired by the image acquiring means in a second space, the second space having coordinate axes corresponding to each of the image feature directions calculated by the feature direction calculating means, based on the feature directions calculated by the feature direction calculating means and the position coordinates calculated by the first image position coordinate calculating means; and space image displaying means for displaying an image showing the whole or a part of the second space where indications according to each of the images are displayed at each of the position coordinates calculated by the second image position coordinate calculating means.