To provide a thumbnail after processing to a user without delay.

A multi-function machine 10 allows a user to select one kind of filter process from among ten kinds of filter processes (S30). The multi-function machine 10 transmits a selected filter information 132 representing a selected filter process to a server 50 (S38). The server 50 sequentially executes the filter processes represented by the selected filter information 132 on a thumbnail according to each of a plurality of parameters corresponding to the filter processes, to generate thumbnails 136 and 140 after processes (S40 and S54). The server 50 transmits the thumbnails 136 and 140 to the multi-function machine 10 (S42 and S56). The multi-function machine 10, when one parameter is selected following the selection of a filter process of one kind, displays the generated thumbnail according to the parameter.