This paper treats interactive applications run on a digital TV. Digital TV services include data broadcasting services. Especially, in this paper, the authors propose a framework for developing interactive applications of data broadcast contents integrated with web services on a digital TV. The digital TV has become one of the terminal devices based on the recent ICT (Information Communication Technologies) supporting various intellectual human activities because data broadcast contents are very similar to web contents and can provide any information with multimedia data on a TV screen. The use of a digital TV is also significant to solve the digital divide problem because elder people are used to TV rather than PC. However, there are few data broadcast contents although there are a lot of various types of applications on the Web. Therefore, the integration of data broadcast contents with web services is effective way to enhance application fields of data broadcasting services. In this paper, the authors propose the application framework for that and also show several interactive applications to clarify its usefulness.