An image output system connecting an image input apparatus and an image output apparatus by a close proximity wireless communication, and outputting by the image output apparatus of image data transmitted from the image input apparatus by the wireless communication. The image input apparatus detects a connection condition of the wireless communication, generates a script for defining an output processing according to at least a user operation, and transmits the script to the image output apparatus when the disconnection is detected after image data transmission, and the connection is detected again after disconnection detection. The image output apparatus detects the connection condition of the wireless communication, suspend output processing of the image data when the disconnection is detected during the image data output processing, and controls the image data output processing according to the script received from the image input apparatus when the connection is detected again.