Patent ID: 7672311

Claim:
A communication device connected to a network comprising: an IP address acquisition unit for acquiring an IP address of an apparatus having a predetermined port open from one of a plurality of apparatuses connected to said network, said IP address acquisition unit including a reception unit for receiving a packet flowing through said network, and an analysis unit for analyzing said received packet to extract said acquired IP address and said port number of said predetermined port; a storage unit for storing a set of said acquired IP address and a port number of said predetermined port; a selection unit for selecting a packet which is in accordance with a predetermined protocol from said received packet, wherein when a port number included in said selected packet is said port number of said predetermined port, the IP address included in said selected packet is extracted; and a display unit for displaying a set of said acquired IP address and said port number of said predetermined port, said display unit displaying, instead of said IP address or together with said IP address, a name of said apparatus assigned said acquired IP address.