To eliminate a need of setting wireless communication of an image forming apparatus at each time of wireless communication even in an environment wherein the image forming apparatus is shared among a plurality of information processors.

In an image processing system, an information processor 1 includes an input part 9 for inputting setting information and rewrite permission/inhibition information and an information transmission part for transmitting setting information and rewrite permission/inhibition information, and an image processing apparatus 3 includes: a storage part 17 for storing setting information and rewrite permission/inhibition information; a judgement part 33 for judging whether or not setting information should be rewritten on the basis of rewrite permission/inhibition information when setting information is transmitted from the information processor furthermore after setting information is stored in the storage part 17; and a rewriting part which rewrites setting information on the basis of a judgement result of the judgement part 33.