1. A method for unlocking a system associated with an electronic device, the method comprising: receiving an unlock pattern which is input by a user and is for unlocking the system in an unlocking interface for pattern unlocking; determining whether the unlock pattern is correct or not, and if the unlock pattern is not correct, recording the number of times the user inputs a wrong unlock pattern; when the number of times the user inputs the wrong unlock pattern reaches a preset threshold, displaying an interface requiring the user to indicate whether the unlock pattern is forgotten; when an indication that the unlock pattern is not forgotten is received, returning to displaying the unlocking interface for the pattern unlocking; and when an indication that the unlock pattern is forgotten is received: displaying the unlocking interface for personal information authentication; receiving at least two pieces of personal information input by the user via the unlocking interface; matching the at least two pieces of personal information input by the user with personal information pre-stored in a local database, wherein the personal information pre-stored in the local database is obtained through normal operation of the electronic device unrelated to unlocking or to a security function; and after matching the at least two pieces of personal information input by the user with the personal information pre-stored in the local database: unlocking the system if the at least two pieces of personal information input by the user are consistent with the personal information pre-stored in the local database; or returning to the unlocking interface for pattern unlocking if the at least two pieces of personal information input by the user are inconsistent with the personal information pre-stored in the local database.