Delegated operation system and method

A delegated operation executing system and a method for executing the delegated operation are provided to transmit ID(Identification) information of the delegating client and ID of the delegated client through a request message, if the delegated client requests the corresponding target system for a specific operation. In a delegated operation executing system, a delegated client(210) transmits a request message for requesting the specific operation and including IDs of a delegated client(200) and the delegating client, to a target system(220). A proxy server executes authentication for the delegated client requesting the specific operation, by using the ID of the delegated client included in the request message in receiving the request message and transmits the request message to the target system if the delegated client is authenticated. The target system executes authority authentication for the delegated client by using the ID of the delegating client included in the request message in receiving the request message.