1. An image recording and playing system comprising: an image pickup unit that takes an image; an image processing unit that performs image processing of the image data obtained by taking with the image pickup unit; an image display unit that displays an image on the basis of an image processing result obtained by the image processing with the image processing unit; and an image data memory that stores an image data on the basis of the image processing result, wherein said image processing unit includes: a dissimilar image extracting element that reads extracting objection image data, determines whether the each extracting objection image data is a dissimilar image data to the image data obtained by taking with the image pickup unit, and extracts image data determined as the dissimilar image data; an image data storing element that stores the dissimilar image data; and a thumbnail image creating unit that extracts one of the dissimilar image data stored in the image data storing element, sets the extracted image data as a typical-pattern image data, extracts a plurality of image data similar to the typical-pattern image data, and creates thumbnail image data.