## CONCLUSION 

We found the counts of blog-writing entry is very similar to the revenue of corresponding movie. The counts of blog-writing entry can be used as quasi-revenue. The mathematical model for hit phenomena is presented including the advertisement cost and the communi- cation effect. In the communication effect, we include both the direct communication and the indirect communication. The results calculated with the model can predict the revenue of corresponding movie very well. The conclusion presented in this paper is very useful also in marketing science. 

## Acknowledgements 

The advertisement cost data is presented by Dentsu Inc. The revenue data is presented from the Nikkan Kogyo Tsushinsya. The research is partially supported by the Hit Content Laboratory Inc. 

∗ Akira Ishii : ishii@damp.tottori-u.ac.jp 

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