The invention relates to the technical field of communication, particularly relates to a method, a device and a
system for updating data. The method comprises the following steps: returning the stored data to a user terminal after receiving a
data acquisition request sent by the user terminal; sending a data checking request of the data to a source
station server; and receiving and reserving updated data returned by the source
station server when the data in the source
station server is updated. By adopting the method, the device and the
system for updating data, which are provided by the embodiment of the invention, after the
data acquisition request of the user terminal is received, the data is returned to the user terminal at first, and then whether the data is updated or not is checked out, accordingly, the user terminal can promptly and quickly acquire the data, and the data is checked out as soon as the user terminal sends the acquisition request without waiting for the data expiration period. Therefore, the user terminal can promptly acquire the data, and the
correctness of the local storage data is guaranteed.