FIG. 4: Daily data of the calculated purchase intention (green) and the observed number of blog- writing entry(red) for the Da Vinci Code in Japanese market. . The validity of the mean field approximation we introduced can be confirmed in fig.9 where we compare the present calculation for Always with the calculation of the mathe- matical model for hit phenomena using the scale free network model as the network of the direct communication instead of the mean field approximation. The detail of model using the scale free network will be published elsewhere[3]. The indirect communication is not included in the calculation of the scale free network. The result shows us that the mean field approximation is farly good approximation, though the tail of the counts of blog entry can have the information of the human communication in the society. Therefore, we can conclude that the mathematical model presented in this paper can simulate hit phenomena at least for movie entertainment. It is very important meanings in the marketing science, because it is possible to predict whether movie will hit or not. However, we should mind that the case of the movie entertainment is very simple case as hit phenomena, because there ara no competition with other movies, in principle. No one who cannot watch the Da Vinci Code because of occupied seats tries to watch Harry Potter. 10