12. A method of inferring a position context in a context-aware method using an ubiquitous context-aware agent based on a sensor network, the method comprising: determining a type of an object through monitoring context information in real time, and creating an object model and an object area model if the type of the object is a static object; detecting a qualitative state if the type of the object is a moving object in the operation of the determining and creating or if the object model and the object area model are created in the operation of the determining and creating; generating a qualitative state message based on the detected qualitative state and storing the generated qualitative state message; generating an object relation message by inferring an object relation using the qualitative state message and storing the generated object relation message; and generating a semantic model using a stored object relation model, generating a semantic model message according to the generated semantic model and storing the semantic model message.
12. A method of inferring a position context in a context-aware method using an ubiquitous context-aware agent based on a sensor network, the method comprising: determining a type of an object through monitoring context information in real time, and creating an object model and an object area model if the type of the object is a static object; detecting a qualitative state if the type of the object is a moving object in the operation of the determining and creating or if the object model and the object area model are created in the operation of the determining and creating; generating a qualitative state message based on the detected qualitative state and storing the generated qualitative state message; generating an object relation message by inferring an object relation using the qualitative state message and storing the generated object relation message; and generating a semantic model using a stored object relation model, generating a semantic model message according to the generated semantic model and storing the semantic model message. 16. The method of claim 12 , wherein in the operation of the generating a semantic model and generating a semantic model message, the semantic model is inferred with reference to a semantic model basic knowledge including previously-defined rules based on characteristics of the static object by receiving the object relation message, and the semantic model message with a predetermined format is created and stored.