PROBLEM TO BE SOLVED: To perform communication while reducing processing load on service providing side. SOLUTION: The image processing system configured to connect an image forming apparatus to a service providing system through a network to perform image processing includes: a task processing means that makes an image processing request, after receiving a valid image processing request, while adding identification information showing an internal communication from the service providing system to user information obtained by querying a user management means for user information; a task management means that stores a task showing the image processing request obtained from the task processing means in a task queue, after confirming the internal communication by the identification information, and receives an inquiry about the task from one or more image processing means; and the one or more image processing means that obtain, with respect to the image processing request shown by the task stored in the task queue, the processible image processing request to perform the image processing. COPYRIGHT: (C)2011,JPO&INPIT