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Location-based context awareness services can embody ubiquitous computing environments in all living environments. To achieve this, since location-based context awareness services need to be provided in various mobile devices, the configuration of open-type context awareness service is required. In this article, a spatio-temporal context manager, which serves as an important element in the ubiquitous location-based context awareness service, needs to be designed so as to be matched to an open-type platform. The suggested model includes a context manager, a spatio-temporal manager, an inference engine, a context history and a knowledge base. In particular, by introducing a spatio-temporal manager to the operation of inferring context awareness, a spatio-temporal context can be more variably inferred compared to conventional service.