PROBLEM TO BE SOLVED: To provide an image display apparatus that can briefly and accurately search preferable reference image data in comparing diagnostic image data with reference image data collected in the past and displaying the data.SOLUTION: The image display apparatus includes: a region-of-interest setting means for setting any region in image data as a region of interest a first label information input means for allowing input of first label information in association with the region of interest a data storage means for storing region-of-interest data of the region of interest and the image data, in association with each other as reference image data a second label information input means for inputting the second label information related to the first label information a reference image data extraction means for extracting the reference image data corresponding to the second label information and a display means for displaying the extracted reference image data.
