A system for downloading real-time interaction data and a method thereof are provided. The system includes a real-time interaction data management server farm, a network equipment, a carousel server, and at least one terminal device. The real-time interaction data management server farm processes real-time interaction data and manages a plurality of real-time data packages thereof. The network equipment provides a unidirectional broadcast network and a bidirectional mobile network as media for transmitting the real-time data packages. The carousel server receives the real-time data packages and transmits the real-time data packages in a carousel delivery method, a single-pass delivery method or a carousel and single-pass delivery method through the unidirectional broadcast network. The terminal device receives the real-time data packages through the unidirectional broadcast network or requests and receives the real-time data packages through the bidirectional mobile network. Thereby, the real-time interaction data can be quickly downloaded in a mobile environment.