Abstract: A digital television transmitter transmits a transport stream (hereinafter referred to as “TS”) comprising content data for a plurality of channels to receivers. In the transmitter, program information is periodically inserted in the TS; and an expected time of program alteration is included in said TS. A television receiver comprises a first portion always supplied with an electric power, a second portion which, if supplied with a second electric power, becomes capable of collecting program information included in said TS in corporation with said first portion, and a third portion which. if supplied with a third electric power, becomes capable of displaying said program. At an expected time of program alteration previously received, the second power is supplied to the second portion to collect program information, which is preferably stored in nonvolatile memory.

Abstract: Viewer individual attribute information indicating an attribute of a particular viewer such as an age, male or female, a resident district, a taste, an occupation and a life style is stored in a receiving terminal apparatus of the particular viewer. When a broadcasting program is transmitted from a service supply apparatus to the receiving terminal apparatus, service addition information indicating an attribute of the broadcasting program or an attribute condition required of viewers is transmitted to the receiving terminal apparatus with contents of the broadcasting program. In the receiving terminal apparatus, the service addition information is collated with the viewer individual attribute information of the particular viewer, and it is judged whether or not the broadcasting program is suitable for the particular viewer. In cases where the broadcasting program is suitable for the particular viewer, the broadcasting program is received by the receiving terminal apparatus and is reproduced and displayed.

Abstract: A system capable of storing the application packages and thereafter reproducing a desired one of the stored application packages at any time. The application package comprises a plurality of applications. Each of the applications comprises application data which comprises forms a main body of the application and service adding information (SAI) comprising various data including an application ID of the application. The SAIs are distributed independently from and prior to the application data. Each of the SAIs can include method IDs of methods for processing object data specified by a method processing program and a plurality of link data comprising application IDs of other applications. This permits the SAIs to form a tree structure of the applications. The methods are activated in a event driven manner.

Abstract: An interactive television system which can provide services such as entertainment programs to users or conduct electronic polls of users, formed of a central computer installation, a plurality of terminal apparatuses each bidirectionally communicating with the central computer installation via a CATV network and each providing video/audio inputs to a display apparatus, with each of the terminal apparatuses being linked to one or more remote control apparatuses whereby users can request services or participate in polling, and in which any message data such as a service request which is issued by a remote control apparatus is automatically accompanied by identifier information, read out from a memory of the remote control apparatus, for identifying that remote control apparatus, and may also be accompanied by personal information concerning a registered user of the remote control apparatus.