The service providing device transmits a registration screen to the information processing device upon receipt of a registration request of an image forming device from the information processing device, transmits a command for causing the information processing device to search the image forming device and to respond to the service providing device with a search result upon receipt of an instruction from the information processing device via a registration instruction unit displayed on a registration screen, registers the image forming device depending on information included in the search result responded according to the command, and initiates communication with the registered image forming device.