We propose a unified ubiHome application service model which provides user-centered services by exploiting intelligent context-awareness. Recently, most of research related to smart home focused on the infrastructure rather than a user, and did not consider effective use of context. Such approaches are not appropriate for a user-centered interface, intelligent home control, flexible extension of application service, etc. In this paper, we design a unified ubiHome application service model by exploiting ubi-UCAM (unified context-aware application model). The proposed model provides services corresponding to a user's intention and also supports flexible interaction between a user and ubiHome environment. It provides personalized ubiHome environment to each user. The proposed model contributes flexible interaction between a user and ubiHome environment. And it provides personalized ubiHome environment to a user and simplifies extension of various application services. Therefore, the proposed model helps ubiquitous applications obtain users' context and provide adaptive applications flexibly.