An information processing system in which a warning is generated in advance when a macro including unsupported functions is executed, realizing improved usability for users. A multi-function apparatus and a server holding at least one macro indicative of a procedure for executing at least one function are connected to each other via a network. A macro referring section provided in the multi-function apparatus acquires a macro held by the second information apparatus. An unsupported function checking section provided in the server detects functions that cannot be realized by the first information apparatus from among functions included in the macro. A warning information providing section provided in the second information apparatus creates warning information relating to the detected unsupported functions and transmits the warning information to the multi-function apparatus. A warning section provided in the multi-function apparatus notifies a user of the transmitted warning information.