Abstract: A maintenance information supply system, including: a host terminal including a data base for storing information regarding a periodic inspection time or a part replace time for a predetermined electronic device terminal; and the electronic device terminal, provided with an information sending/receiving function for communicating with the host terminal. The electronic device terminal sends to the host terminal, device kind information and present position information or working environment information. The host terminal searches the information regarding the periodic inspection time of the electronic device terminal or a part replace time from the data base. The host terminal calculate maintenance information according to the present position information or working environment information, and a predetermined calculation table, so as to send the maintenance information to the electronic device terminal; and the electronic device terminal receives the maintenance information from the host terminal.