The number of similar case images to be displayed is changed according to the number of times and progress of imaging diagnosis. First examination judgment means is added to a medical image interpretation support system comprising storage means for storing image data sets obtained by imaging subjects, similar case image search means for extracting similar case image data sets having a characteristic similar to an interpretation target image from the image data sets, and display control means for controlling display of the interpretation target image and the similar case images. The display control means controls the display so as to display a larger number of the similar case images together with the interpretation target image in the case where the interpretation target image has been judged to be a first examination image than in the otherwise case.