5. The system according to claim 2 , wherein said feature identifier identifies said related product features in each said feedback of said set of feedbacks with a pre-defined feature words library.
2. The system according to claim 1 , wherein the support degree calculating instruction comprises: a feature identifier configured to identify related product features in each of said evaluating sentences and said related product features in each feedback of said set of feedbacks; an association instruction configured to associate said evaluating sentences in said review with said feedbacks by relying on said respective related product features; and a support determining instruction configured to determine whether said evaluating sentences are supported by associated feedbacks.