A diagnosis support method capable of promoting upload of a large amount of case image data. This method includes the steps of: transmitting case image data and case region information from a provider to a server in order to register case images; recording the case image data and so on; transmitting the case region information from a requester to the server in order to refer to a case image; retrieving the case image data; transmitting list information of the case images; displaying the list of the case images; identifying a selected case image; retrieving the case image data and incrementing a number of times of use; transmitting the retrieved case image data; displaying the case image; and transferring the amount of money in accordance with the number of times of use of the respective case image data to the account of the provider.