A medical image information system of an embodiment includes: a terminal device and a medical image processing server connected via a network, wherein the medical image processing server includes a medical image storage unit in which a medical image is stored, and an image processing unit that generates, from the medical image, a display screen and display screen information based on a request from the terminal device to transmit to the terminal device, and the image processing unit includes a speed-lowering determination unit that determines, based on either related information of a medical image or connection status of the terminal device or both, a setting item pertaining to a wait process for lowering a transmission timing of a result of image processing, and a speed-lowering processing unit that carries out a wait process for lowering a transmission timing of the display image based on the setting item.