Service design has to incorporate many factors into its consideration in order to realize its core thinking, that is, high value and high productivity.  Based on the ideas of this new research field, authors develop a personalized daily-life activity recommendation service that includes information behavior, business value, and technology architecture as our service design considerations. Their service can be requested under a ubiquitous environment and include users’ contextual information which is an important factor in information behavior. With regard to IT architecture, authors use the service-oriented architecture (SOA) that provides the flexibility and extensiveness of technology as well as permit new innovative services to be easily added.