An image transmission system includes an image transmission device and a server that provides recipient information including recipient specification information and a transmission method and destination for image data. The server records, in association with a recipient identifier, recipient-designated recipient information and display mode designation information indicating a display mode for the recipient information. Each time the recipient information and display mode designation information is updated, the server overwrites the recorded information with the updated recipient information and display mode designation information. The image transmission device receives a selection of a recipient identifier for image data transmission, and if the selected recipient identifier is associated with the recipient information and display mode designation information in the server, acquires such information from the server, and when transmitting image data based on the recipient information, displays the recipient information according to a display mode indicated in the acquired display mode designation information.