1. An image processing system comprising: an information processing apparatus; and one or a plurality of image processing apparatuses that can be connected to the information processing apparatus via a network, wherein the information processing apparatus includes: an identifying information storage part for storing identifying information given in advance in such a way as to be common between the information processing apparatus and the respective image processing apparatuses in a mode in which, with respect to one or a plurality of functions provided in the image processing apparatus, a set value of the function, and a function group into which the functions are grouped, a corresponding relationship between the function group, the function, and the function set value is described; a screen information making part for making screen information which includes identifying information of at least one of the function group, the function, and the function set value and which is used for displaying a function setting screen; and a sending part for sending the screen information made by the screen information making part to the image processing apparatus in response to an acquisition request from the image processing apparatus, and wherein the image processing apparatus includes: a sending part for sending the acquisition request of the screen information to the information processing apparatus; a receiving part for receiving the screen information sent from the information processing apparatus; a display part; an identifying information storage part for storing the identifying information related to a kind of the function provided in the apparatus, a set value of the function, and the function group and, in a case where a function and/or a function set value are/is newly added, for storing also identifying information of the added function and/or the added function set value; an identifying part for identifying a function whose function set value is to be displayed on the function setting screen from among the identifying information included in the screen information received by the receiving part; and a display control part for displaying all function set values of the function identified by the identifying part of the functions whose identifying information are stored in the identifying information storage part of the apparatus on the display part in a mode that can be selected by a user.