A method for processing data, a terminal, a subscriber identity module card and a system are disclosed. The method includes: when a terminal is in a dormant state, keeping providing a working power supply for a subscriber identity module card and a specified electronic device within the terminal, so that the subscriber identity module card and the specified electronic device keep in a working state; the subscriber identity module card collecting working data of the specified electronic device and then storing the working data; and when the terminal quits from the dormant state, the terminal extracting the working data.