Abstract: A centralized control system comprising interface circuits which are provided in respective terminal devices requiring field service such as copying machines or automatic vending machines and collect functional information concerning functions of the terminal devices and abnormality information showing their abnormality; communication units which are provided at every one or plural interfaces circuits and transmit collected information as the need arises; and remote control device which receives transmitted information and selectively displays it on a display unit to execute a plurality of control processing at every terminal device. Abnormality information is announced whenever it occurs or at a predetermined time according to a degree of abnormality, and information concerning the abnormality information announced is displayed on a part or full of the whole display picture screen concerning all the control processing.