1. A diagnostic imaging support device comprising: image data acquisition portion that acquires image data of high magnification of sample tissue; image classifying portion that generates image data of low magnification from the image data of high magnification acquired by the image data acquisition portion, extracts a region of interest from the generated image data of low magnification, calculates a feature value indicating a feature of the region of interest, and classifies the generated image data of low magnification into group by each image data pattern of a plurality of pathological tissue according to the calculated feature value; and image evaluating portion that extracts a region of interest from the image data of high magnification based on the image data of high magnification which is a base of the image data of low magnification classified by the image classifying portion, and the region of interest of the image data of low magnification, calculates a feature value of the region of interest, and evaluates whether or not the image data of high magnification is pathological tissue of the classified group based on the calculated feature value.