| 摘要 |
Supplemental program information is provided to a television in conjunction with a television program, where the supplemental program information is related to the subject matter of the television program. The supplemental program information and an access number are embedded in a digital video data stream of the television program. The digital video data stream is transmitted and received, and the access number is extracted from the received data stream. Based on the extracted access number, a determination is made whether the supplemental program information will be provided to the television. The television program may be an advertisement, and the supplemental program information may be advertising information related to the subject matter of the advertisement. For example, the supplemental program information may be a URL pointing to a web page that describes features of an advertiser's product. Once activated by a valid access number, a graphic image is inserted into the advertisement indicating that further product information is available on the web page.
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