The present invention is intended to permit both real-time display of a picture represented by a non-compressed video signal on a television and display of a picture represented by a compressed video signal at any desired time by simultaneously transmitting the compressed video signal and non-compressed video signal via one interface. An STB packetizes a compressed video signal, and multiplexes the compressed video signal and a blanking signal combined with a non-compressed video signal. Thus, both the video signals are transmitted simultaneously. A picture represented by the non-compressed video signal is displayed on a television in real time. The compressed video signal is stored in a storage medium incorporated in the television, read at any user's desired time, and decoded so that a picture represented by the compressed video signal can be viewed at the user's desired time.

The present invention is intended to permit both real-time display of a picture represented by a non-compressed video signal on a television and display of a picture represented by a compressed video signal at any desired time by simultaneously transmitting the compressed video signal and non-compressed video signal via one interface. An STB packetizes a compressed video signal, and multiplexes the compressed video signal and a blanking signal combined with a non-compressed video signal. Thus, both the video signals are transmitted simultaneously. A picture represented by the non-compressed video signal is displayed on a television in real time. The compressed video signal is stored in a storage medium incorporated in the television, read at any user's desired time, and decoded so that a picture represented by the compressed video signal can be viewed at the user's desired time.

A facility for updating software installed on a media device in connection with installation of the media device in customer premises is described. Outside the customer premises, the facility transfers a later-issued version of the software installed on the media device from a server to a portable storage device. Within the customer premises, the facility transfers the later-issued version of the software installed on the media device from the portable storage device to the media device for installation on the media device.

Disclosed are a social television state synchronization system and method, comprising: a first social television client being set to send a subscription request message to a second social television client; the subscription request message carrying a social television state subscribed by the first social television client; the second social television client being set to, when one or more items in the corresponding subscribed social television state are changed, send a state change notification message to the first social television client according to configuration of the second social television client or according to a service or content provider policy; the first social television client being further set to, according to configuration of the first social television client and the changed social television state carried by the state change notification message, synchronize a current social television state of the first social television client with the changed social television state of the second social television client. By means of the present invention, an objective that users watch a program synchronously and perform social interaction is implemented.

The present invention is intended to permit both real-time display of a picture represented by a non-compressed video signal on a television and display of a picture represented by a compressed video signal at any desired time by simultaneously transmitting the compressed video signal and non-compressed video signal via one interface. An STB packetizes a compressed video signal, and multiplexes the compressed video signal and a blanking signal combined with a non-compressed video signal. Thus, both the video signals are transmitted simultaneously. A picture represented by the non-compressed video signal is displayed on a television in real time. The compressed video signal is stored in a storage medium incorporated in the television, read at any user's desired time, and decoded so that a picture represented by the compressed video signal can be viewed at the user's desired time.