In the present competitive business environment, designers and engineers need to come up with creative, innovative and valuable design ideas. In engineering design, the function (F), behavior (B) and structure (S) of a product are discussed using design theory and methodology. On the other hand, the concept of user experience (UX) is becoming important in product design. In this paper, we first discuss the relationship among F, B, S, UX and the value of a product. Then we propose a delta design map as a framework for a systematic method and computational tool for design ideation support. A delta design map does not describe F, B, S and UX for design examples but describes their differences (delta) between design examples. This approach makes the descriptions efficient and gives clear criteria on what needs to be described and what need not be described. By preparing a delta design map, we can systematically and exhaustively analyze the potential similarity among all design examples from the viewpoint of F, B, S and UX and obtain triggers for ideation. The results of a simple trial of the proposed method are presented and discussed in this paper.