1. A context inference system, comprising: a mobile device, comprising: a information receiving unit, receiving at least one context information; and a context operation platform, coupled to the information receiving unit and performing a context inference process, the context operation platform comprising: an information collection module, collecting information used for inferring a context; a data classification and storage module, storing and classifying a user preference information of a user; and a inference module, inferring the context; and at least one information sending unit, transmitting the at least one context information to the mobile device, wherein the at least one information sending unit is mounted on at least one object, and the at least one context information is a related information of the at least one object; wherein the context operation platform performs the context inference process based on the received 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 inference process comprises: receiving and collecting the at least one context information by using the information receiving unit and the information collection module; inferring the context based on the user preference information and the at least one context information by using the inference module; and generating the recommendation information according to the context by using the inference module, wherein the step of inferring the context comprises a convergent search and an expanded search.
1. A context inference system, comprising: a mobile device, comprising: a information receiving unit, receiving at least one context information; and a context operation platform, coupled to the information receiving unit and performing a context inference process, the context operation platform comprising: an information collection module, collecting information used for inferring a context; a data classification and storage module, storing and classifying a user preference information of a user; and a inference module, inferring the context; and at least one information sending unit, transmitting the at least one context information to the mobile device, wherein the at least one information sending unit is mounted on at least one object, and the at least one context information is a related information of the at least one object; wherein the context operation platform performs the context inference process based on the received 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 inference process comprises: receiving and collecting the at least one context information by using the information receiving unit and the information collection module; inferring the context based on the user preference information and the at least one context information by using the inference module; and generating the recommendation information according to the context by using the inference module, wherein the step of inferring the context comprises a convergent search and an expanded search. 5. The context inference system according to claim 1 , wherein the related information comprises a plurality of characteristic values regarding the at least one object, a plurality of characteristic values regarding the location of the at least one object, a current time, or a combination of the characteristic values regarding the at least one object, the characteristic values regarding the location of the at least one object, and the current time.