1. A method, comprising: determining, by a processor, incremental images of first medical images of a same region of a first object relative to a reference image, wherein each of the incremental images corresponds to a respective medical image of the first medical images, wherein each of the incremental images represents one or more determined differences between the reference image and a medical image corresponding to the incremental image, and wherein a storage space required to store the incremental images is less than a storage space required to store the first medical images; determining, by the processor, a first change trend of the medical images according to the incremental images, wherein the first change trend indicates a trend regarding one or more changes in the first object; comparing, by the processor, the first change trend with a second change trend of second medical images of a region of a second object that corresponds to the first region to obtain a similarity degree between the first change trend and the second change trend; sending first information to a terminal of the first object when the first change trend exceeds a preset threshold, wherein the first information indicates the first change trend and the similarity degree; and sending appointment information of a medical institution to the terminal, wherein the appointment information indicates an available medical resource of the medical institution.