1. An analysis apparatus that is able to access and analyze the contents recorded in a history recording part that records access records to access destinations accessed by user terminals via a communication network, the analysis apparatus comprising: a history analysis part analyzing a trend of the access history for each unit period and deriving a latent trait indicating the latent possibility of access to a preset target access destination for each session from the contents recorded in the history recording part that records, for each session, the access history indicating an access or non-access to the access destination and the preset target access destination; a principal component analysis part analyzing principal components of a frequency distribution of the access corresponding to the latent trait for each unit period derived by the history analysis part; a classification part classifying a correlation of the principal components for each unit period into a plurality of classes based on the analysis result of the principal components; an event recording part recording, for each unit period, the contents of events executed to induce the access to the target access destination; a first generating part deriving the distribution of internal latent traits for each principal component and generating a latent trait principal component table stored the principal component and the distribution of the latent trait in correspondence with each other; a second generating part generating a class construction ratio table stored, in correspondence with each other, the class as a result of classification by the classification part and the principal component construction ratio based on the correlation of the principal components for each class; a third generating part generating an event classification table stored, in correspondence with each other for each unit period, the class as a result of classification by the classification part and the contents of the event recorded in the event recording part; and an analysis result recording part recording the latent trait principal component table generated by the first generating part, the class construction ratio table generated by the second generating part and the event classification table generated by the third generating part, as an event feature model of the effect on the execution of the event.