A data terminal, a data distributing system, and an Internet telephoning system are provided where desired data such as advertisements can selectively be determined and used for enjoying its relevant services. The data terminal receives a summary of service data from a data provider apparatus over the Internet, and if desired, demands the data provider apparatus to provide the service data over the Internet. The service data from the data provider apparatus may selectively be received in at least one of an audio form, a text form, and a video form at the data terminal. The service data may be advertisement data, commercial product data, and entertainment data such as music, movies, and games. The entertainment data may selectively be presented as at least one of the title, the artist name, the cost, and a trial sample piece of the content.