A center-side processing system and monitoring processing systems of monitoring objects are connected through a network. The center-side processing system includes a module for producing monitoring and diagnostic algorithms of the monitoring objects, software producing module for producing monitoring and diagnostic software from the monitoring and diagnostic algorithm, a module for producing a transmission schedule of the monitoring and diagnostic software, transmitting module for transmitting software according to the transmission schedule, a module for correcting and changing the monitoring and diagnostic software from data received from the monitoring processing system, and verification module for performing verification before the transmission of the monitoring and diagnostic software. Each of the monitoring processing systems includes a module for receiving the monitoring and diagnostic software, execution processing module for executing the monitoring and diagnostic software, a module for automatically verifying the monitoring and diagnostic software, and transmitting module.