Patent ID: 7167879

Claim:
A network AV system, comprising: a server having a database capable of storing a plurality of contents; an uploader capable of connecting to said server and requesting said server to update the database; and a client capable of connecting to said server, receiving a content selected among said plurality of contents from said server, and reproducing the selected content, said uploader comprising: a request start notifier transmitting a request start notification to said server; an updating requester transmitting to said server a plurality of updating requests to update the database after said request start notifier transmitting the request start notification; and a completion notifier transmitting a request completion notification to said server after said updating requester transmits the plurality of updating requests, said server comprising: an updater responsive to the plurality of updating requests and updating the database; a recorder recording a receipt of the request start notification when receiving the request start notification; a determiner determining whether or not the receipt of the request start notification has been recorded when receiving the request completion notification; and an updating notifier transmitting an updating notification to said client when said determiner determines that the receipt of the request start notification has been recorded, the updating notification indicating that the database has been updated.