Method, server and system for user information updating

The invention provides a method, a server and a system for user information updating and relates to the field of data services. The method, the server and the system for user information updating aim to solve the technical problem that synchronization services in the prior art require manual triggering of synchronization service request. The method for user information updating includes: the server acquires updating information of a first user; the server searches a second user according to the first user, wherein the second user is in a trust association relation with the first user; and the server sends the updating information of the first user to the second user. The method, the server and the system for user information updating can be used for cloud computing networks and are capable of automatically updating and synchronizing user information by the aid of cloud computing terminals.