A data processing method and system based on an asymmetric P2P network are described. The system includes: a data server, configured to store a to-be-downloaded resource; a computer terminal group, including at least one computer terminal, configured to download the to-be-downloaded resource from the data server and/or another computer terminal in the computer terminal group; and a mobile terminal group, including at least one mobile terminal, the mobile terminal establishing a communication relationship with the data server and the computer terminal, and being configured to download the to-be-downloaded resource from the data server and/or the computer terminal, any two mobile terminals in the mobile terminal group being incapable of downloading the to-be-downloaded resource from each other, and the computer terminal in the computer terminal group being also incapable of downloading the to-be-downloaded resource from any mobile terminal.