1. A vehicle information processing system for using a Bayesian network model to provide a probabilistically appropriate recommendation to a recipient who receives the recommendation, the recipient being an occupant comprising: a model storage unit containing a plurality of different Bayesian network models depending on the recommendation-condition, wherein the recommendation-condition is a condition on the recipient side who receives a recommendation; a model determining unit for determining a model corresponding to the recommendation-condition as an application model from the models stored in the model storage unit; a reasoning unit for reading out the application model determined by the model determining unit from the model storage unit and for obtaining a recommendation through probabilistic reasoning that uses the read-out application model; and a recommending unit for providing the recommendation obtained by the reasoning unit to the recipient.