Cloud caller identification system and method thereof

The invention provides a cloud caller identification system and a method of the cloud caller identification system. The cloud caller identification system comprises a cloud servo device, a first mobile communication device and a second mobile communication device, wherein the first mobile communication device transmits a first contact person list to the cloud servo device, and the second mobile communication device obtains the first contact person list from the cloud servo device. When the second mobile servo device receives a communication request from an external communication device, an incoming call number of the external communication device is compared with the first contact person list, the name of a contact person which corresponds to the incoming call number is sought, and the name is displayed on the second mobile communication device.