The invention discloses a big data processing method and system based on a terminal. The method comprises: a terminal searching an application program and sending information for identifying the source of the application program to a judgment server for judgment; based on the judgment result, the terminal determining to re-try to download from other resources if the terminal is malicious, and if the terminal is safe or undetermined, the terminal directly downloading the application program or selecting by a user: installing after direct downloading, and extracting information and sending the information to the judgment server for analysis; based on the analysis result, keeping the application program if safe, and unloading the application program if the application program is malicious; after the terminal determines to reserve the application program, performing authority management so as to enable or forbid the application program when the application program runs and accesses sensitive or private data on the terminal; and when the terminal has a new instant messaging message and the application program requests to access, enabling or forbidding the access of the application program according to the authority of the application program, the information type contained in the new introduced instant messaging message and the combination of the information type and the combinationof the information type.