A method for buffering monitored data received from a monitoring device. The received monitored data is buffered into a buffer area and all of the monitored data from the buffer area is stored to a database server when a current count of data in the buffer area equals a recycling predetermined count N. An address of the received monitored data is recorded in a data list. When a monitoring server receives request for monitored data from a client server, the required one or more items of monitored data is read from the buffer area and sent to the client server.