Today, environmental concerns caused by industrial products have grown up to a critical amount that can not be ignored. It requires us to worry about the environmental issues, particularly, from the viewpoint of trade-off relationships at the design stage. This paper presents the concept and the implementation of the Green Browser, which is intended to enable the designer to clarify trade-off relationships among goals of the product over its life-cycle. The concept of the Green Browser is a model sharing for life-cycle design and the representational scheme of the model. The model sharing mechanism between designers and users on the Web are implemented. A case study on building the strategy model of a refrigerator is presented to illustrate the strategy model.