Data transfer controlling method, content transfer controlling method, content processing information acquisition method and content transfer system

Disclosed are a data transmission control method, a content transmission control method, a content processing information acquisition method, and a content transmission system. In the data transmission control method, in a data compatible environment, a data transmission request is received from a client, information about an entity to be involved in the data transmission, and a chain including at least two entities is included by using the collected object information. And transmitting a plurality of data through the chain and receiving an event message indicating a transmission state of the transmitted data from at least one of the entities included in the chain. Therefore, a plurality of data can be controlled to be transmitted in one transmission session, and a data transmission state can be received through an event.