Abstract: The present invention allows a user themselves to establish the operating state of a system. A virtual desktop system (100) is provided with a virtualization server (20) provided with virtual desktops (21) thin client terminals (40) for using the virtual desktops (21) by remote connection and a plurality of network processing devices (30) for connecting the virtualization server (20) and the thin client terminals (40). Each of the network processing devices (30) is provided with an IP flow management means (311) for managing information about the IP flow relating to the remote connection of the thin client terminal (40); and an IP flow status notification means (315) for notifying a new client terminal that the IP flow relating to the IP packet does not satisfy a predefined bandwidth or delay time when an IP packet relating to the remote connection is received.