A method, a system, a document management server, a presence server and a delegation check processing unit for setting configuration information of a presentity client are used to solve the problem that the setting of configuration information must be done by a presentity client and cannot be delegated to other entities. The method for setting configuration information of a presentity client includes the processes of: determining a configuration request message sent from a configuration request sender is in delegation mode; confirming qualification of the configuration request sender according to delegation setting authorization rules set by the presentity client; and setting the configuration information of the presentity client according to the configuration request message.