To provide a system in which image data created in an image processor is processed in association with an application activated on a user terminal. The system includes an image processor, and a user terminal connected with the image processor over a network. The image processor includes: an activated application identifying unit for obtaining information about an application activated on the user terminal; a one-touch key generating unit for generating a one-touch key including information for processing image data by the application activated on the user terminal; and a transmission unit for transmitting the image data to the user terminal. The user terminal includes: a receiving unit for receiving the image data from the image processor; and a one-touch key processing unit for processing the image data by the application activated on the user terminal, based on the information of the one-touch key.