Abstract: The purpose of this study is to investigate the concept of the architectural planning with an extended meaning considering the forms and the functions of the architectural space not from the process of the morphogenesis based on similarity or the process of the morphogenesis represented by the images. Therefore, it is aimed to propose the architectural planning proposal applying not the notion of the metaphor based on similarity but the concept of the metonymy. For this purpose, this study compared the concept of the metonymy and the metaphor and based on the possibility of the concept of metonymy, suggested an alternative architectural design plan. The concept of the metonymy applied to this study is as follows. First, the concept of the metonymy that can be applied to the architectural space planning is a comprehensive concept that can be applied to the relationship between non-material and material elements such as the forms and the functions. Second, the architectural space to which the concept of the metonymy is applied is not a fixed space that accepts a given program but a user-oriented space that is considered as a complex structure of the forms, functions and programs. Third, through the process of the metonymy based on the psychological perception process, space with different physical conditions can be used integrally and it is possible to have the flexibility of the forms and the functions.