Large data system

The invention provides a large data system. The large data system comprises a more than one data base, a data extraction device and a data warehouse, wherein the data warehouse is used for storing business data of a user, the data warehouse is connected with more than one data base through the data extraction device, the data extraction device is used for extracting the data contents of more than one data base to obtain data meeting the format of the data warehouse, and transmitting the extracted and settled data into the data warehouse, and the data warehouse is used for analyzing and excavating the extracted and settled data, so as to obtain valuable data. A perfect large data system can be provided.