Evaluation of train scheduling is an important step for efficient use of restricted transportation facilities to improve the severe congestion in metropolitan area. This paper proposes a method for evaluating train scheduling from the view point of user's benefit. First, we formulate the model which represents a train diagram as a time-space network and explains user's behavior on the diagram network. Next, the criteria for evaluation of train scheduling is presented. This model is applied to a railway in Tokyo metropolitan area, and the applicability is validated. Finally, some train schedulings in Tokyo metropolitan area are evaluated by the method.