An image input system capable of applying to a system using a cloud computing and of selecting the optimal transmission route. The image input system comprises a server, an information processing apparatus that communicates with the server via the Internet, and image input apparatuses communicate with the information processing apparatus via a local network and communicate with the server via the Internet. The server acquires the transmission capacity information of the image input apparatuses searched, selects a first route that directly transmit to the server or a second route that transmit to the server via the image processing apparatus based on the transmission capacity information, and transmits a job message to the information processing apparatus. The information processing apparatus transmits the job message to the image input apparatus selected. Each of the image input apparatuses generates the image information and transmits it to the server.