Almost all traditional methods of advertisement distribution have been concerned only with primary information distribution via certain kinds of media. However, the rapid growth of the Internet and interactive media have demonstrated the power and efficiency of secondary information distribution of information by consumers such as words of mouth and free-mail. However, an advertisement distribution model which can be used to analyze and measure the effectiveness of such secondary distribution has never been discussed. Therefore, in this paper, we propose an advertisement distribution model and show how to use the model to analyze both primary and secondary information distributions. Our experiment and analytical results are also discussed. The experimental result shows that the proposed model can be used to measure and analyze the effectiveness of advertisement distribution.