The invention relates to a method and a system. The proposal of the invention is to prevent the deadlock caused by a plurality of concurrent transactions during the updating process of a plurality of database. The system comprises an access order storing unit for storing the access order to a plurality of database in advance; a data claim receiving unit for receiving the data claim of the data ina database to be update from the transactions; a data loading unit for loading the data used as the target of the data claim to a virtual data region from the database; a updated-data storing unit for storing the information about the updated data by responding to the data in the virtual data region, which are updated by the transactions; and a data ordering unit for ordering the stored information according to the access order by responding to the finishing of the transactions, wherein, the ordered information are used for updating the database.