A medical image display system includes a client and a server. The client is able to display a plurality of images on a display. The server includes a hardware processor which stores data of a plurality of images in a storage, which obtains environment information regarding a viewing environment of the image, which determines an image transfer condition regarding transfer of the image to the client based on the obtained environment information, which selects as target images at least some of the plurality of images stored in the storage based on the image displayed on the client and the determined image transfer condition, and which transfers the selected target images to the client using a communicator.