In the previous study, the construction guideline of IT infra-structure for a u-City was introduced. However, it is only concentrated on the components and construction procedure for provider-oriented and technology-oriented sensor networks. In this paper, it is described (1) introduction of the construction guideline of IT infra-structure for a u-City, (2) the problems of the previous study, and (3) the enhancement direction of the construction guideline of IT infra-structure for a u-City.