24. A mobile device, comprising: an information receiving unit, receiving at least one context information; and a context operation platform, coupled to the information receiving unit, performing a context inference process, the context operation platform comprising: an information collection module, collecting an information used for inferring a context; a data classification and storage module, storing and classifying a user preference information of a user; and an inference module, inferring the context; wherein the context operation platform performs the context inference process based on the context information and the user preference information in order to forecast a need of the user and provide a recommendation information to the user, wherein the context operation platform further comprises a service request module for obtaining a service information from a remote server.
24. A mobile device, comprising: an information receiving unit, receiving at least one context information; and a context operation platform, coupled to the information receiving unit, performing a context inference process, the context operation platform comprising: an information collection module, collecting an information used for inferring a context; a data classification and storage module, storing and classifying a user preference information of a user; and an inference module, inferring the context; wherein the context operation platform performs the context inference process based on the context information and the user preference information in order to forecast a need of the user and provide a recommendation information to the user, wherein the context operation platform further comprises a service request module for obtaining a service information from a remote server. 29. The mobile device according to claim 24 , wherein the data classification and storage module comprises an ontology technique.