The medical image diagnosis system comprises processing circuitry configured to set values of an image quality indicator selected by a user regarding multiple types of the image quality indicator to display a medical image as an anchor, and generate a first thumbnail image based on the anchor; cause a display to display the first thumbnail image; generate a plurality of second thumbnail images by respectively increasing or decreasing the multiple types of the image quality indicator from the anchor; cause the display to display the plurality of second thumbnail images; calculate a new image quality indicator adjusted with a variable step width; and generate a new first thumbnail image by using a new anchor, display the new first thumbnail image, generate a plurality of new second thumbnail images based on the values of the new image quality indicator, and display the plurality of new second thumbnail images.