Remote passive performance monitoring system

Measure application processing time executed by the server device at the passive monitoring system provides a system for remotely monitoring the load state of the server device. Client devices Cn, the server device S, and the remote network monitoring device M are connected, measured by the remote monitoring device M in a passive monitoring scheme application processing time executed by the server device S by request from the client device Cn a system for being connected to the server device S and the same segment, monitoring the transmission and reception packets of the server device S, has a packet acquisition device PS for recording by adding time stamp information to the packet information, packet collection using the recording packet information to the device PS, the application processing time executed by the server device S by request from the client device Cn, measured by the remote monitoring device M.