1. A network AV system comprising a plurality of servers connected with each other and a client connected to one of said plurality of servers, each said server comprising: a content storage device for storing a plurality of contents; a local list storage device storing an internal local list of contents stored thereby and an external local list of contents stored by the other server; a local list updater updating the internal local list in said local list storage device when the plurality of contents are updated in said content storage device and updating the external local list in said local list storage device upon receipt of the updated external local list from the other server; and a global list transmitter transmitting a global list that includes the internal local list and the external local list stored in said local list storage device to said client.