ER (Entity Relationship) data model has been widely used as a tool for data modeling, especially in the area of MIS (Management Information System). It is simple in expression, and easy to learn and understand. However, it is still not easy for the end-users to understand the implicit meaning of the model. Especially when the data modeler is not experienced, the communication with the end-users becomes difficult. Herein, this paper proposes a prototyping framework of generating forms that can execute with the user operations. This framework provides the editing UI (user interface) with which developers input entities, attributes, and relationships between the entities. The ERD data are stored in a database and this framework automatically generates the object model from the database, which corresponds to the model part in the MVC (model, view, and controller) pattern. The ERD data are stored in a database and this framework automatically generates the object model from the database, which corresponds to the model part in the MVC (model, view, and controller) pattern. From the model, the default forms are automatically generated to the user. The user can input the data into the forms and can easily identify the target system, and can easily understand their requirements, too. Thus, the requirement changes during or after the development are minimized. After having the students of the University of Seoul to draw the ERD about their own selected corporations, we could find the followings: (1) the quality of the ERDs are improved (2) the details of the ERDs are not omitted (3) the effectiveness of the interviews with contacts of the selected corporations is improved.