A surveillance method using multi-dimensional sensor data for use in a surveillance system (100) is provided. The surveillance system (100) includes a plurality of sensors (110) installed within a scene, and the plurality of sensors (110) are classified into a plurality of types. The surveillance method includes the steps of: obtaining each type of sensor data from the scene using the sensors (110); performing a local-object process on each type of sensor data to generate local-object-feature information for each type; performing a global-object process according to the local-object-feature information of each type to generate global-object-feature information; and performing a global-object recognition process on the global-object-feature information to generate a global-recognition result.