A method of controlling an electronic device, the method comprising: displaying a lock screen user interface on a touch sensitive display of the electronic device, wherein the touch sensitive display is capable of detecting contact with a user's body; detecting a user input through the touch sensitive display while displaying the lock screen user interface; verifying the user by determining whether the user input is a predefined input, wherein verifying comprises: extracting an input feature of the detected user input through the touch sensitive display, calculating a similarity between the input feature and predefined verification information; and concluding that the verification of the user is successful when the similarity is greater than or equal to a threshold value or that the verification of the user is unsuccessful when the similarity is less than the threshold value, and wherein the threshold value is set to a predefined value corresponding to a type of an input means for the user input; wherein the input means includes a user's finger and a stylus pen, and the predefined value includes a first value corresponding to the user's finger and a second value corresponding to the stylus pen and different from the first value; searching for an instruction corresponding to at least a portion of the user input, wherein searching for an instruction comprises: extracting at least one recognizable character from the portion of the user input; searching for an instruction corresponding to the at least one recognizable character; and acquiring information regarding an application corresponding to the instruction, wherein verifying the user and searching for the instruction is performed simultaneously according to a scheduling process of the electronic device; the method further comprising: when the verification of the user is successful and the instruction corresponding to the at least a portion of the user input exists, replacing the lock screen user interface with an execution screen of the application corresponding to the instruction. displaying a lock screen user interface on a touch sensitive display of the electronic device, wherein the touch sensitive display is capable of detecting contact with a user's body; detecting a user input through the touch sensitive display while displaying the lock screen user interface; verifying the user by determining whether the user input is a predefined input, wherein verifying comprises: extracting an input feature of the detected user input through the touch sensitive display, calculating a similarity between the input feature and predefined verification information; and concluding that the verification of the user is successful when the similarity is greater than or equal to a threshold value or that the verification of the user is unsuccessful when the similarity is less than the threshold value, and wherein the threshold value is set to a predefined value corresponding to a type of an input means for the user input; wherein the input means includes a user's finger and a stylus pen, and the predefined value includes a first value corresponding to the user's finger and a second value corresponding to the stylus pen and different from the first value; extracting an input feature of the detected user input through the touch sensitive display, calculating a similarity between the input feature and predefined verification information; and concluding that the verification of the user is successful when the similarity is greater than or equal to a threshold value or that the verification of the user is unsuccessful when the similarity is less than the threshold value, and wherein the threshold value is set to a predefined value corresponding to a type of an input means for the user input; wherein the input means includes a user's finger and a stylus pen, and the predefined value includes a first value corresponding to the user's finger and a second value corresponding to the stylus pen and different from the first value; searching for an instruction corresponding to at least a portion of the user input, wherein searching for an instruction comprises: extracting at least one recognizable character from the portion of the user input; searching for an instruction corresponding to the at least one recognizable character; and acquiring information regarding an application corresponding to the instruction, wherein verifying the user and searching for the instruction is performed simultaneously according to a scheduling process of the electronic device; extracting at least one recognizable character from the portion of the user input; searching for an instruction corresponding to the at least one recognizable character; and acquiring information regarding an application corresponding to the instruction, wherein verifying the user and searching for the instruction is performed simultaneously according to a scheduling process of the electronic device; the method further comprising: when the verification of the user is successful and the instruction corresponding to the at least a portion of the user input exists, replacing the lock screen user interface with an execution screen of the application corresponding to the instruction.