To facilitate image processing on an application server, in an application server and a client terminal.

A medium 4 saves a processing image ID, an image-processing application ID and related image IDs, in association with information to identify the application server 1. A medium analysis unit 2a of the client terminal 2 reads the processing image ID, image processing application ID, related image IDs and the application server identification information saved in the medium 4 for identifying the application server 1 from the read application server identification information. An application client function unit 2b transmits the image processing application ID and related image IDs read by the medium analysis unit 2a, to the application server 1 via a network 3 and requests execution by an image-processing application group.

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