1. An information terminal, comprising: an image detector/register to detect an image file unregistered or updated, and structure and manage a list of the image files detected; a face image detector to detect a face image included in an image of the image file detected by the image detector/register, associate information on the face image detected with the image file, and store the information associated; a similar face classification section to calculate an amount of feature of the face image detected by the face image detector, compare the amount of feature calculated with amounts of feature of different face images which are already calculated and classified into groups, calculate a similarity between the face image and the different face images in the respective groups, and classify and manage the face image based on a result of the similarity calculation; and a similar face display section to display at least one image file including the face image classified as the same group on a display screen based on a result of the classification of the face images by the similar face classification section.