1. A method of controlling a function of a wearable electronic device, comprising: detecting a predetermined gesture by a motion sensor of the wearable electronic device, for activating a voice recognition function of the wearable electronic device, wherein the wearable electronic device is worn on a wrist of a user; driving a timer for calculating a time period from an instance when the predetermined gesture is detected; recognizing eyeballs of the user through one or more cameras of the wearable electronic device; activating a touch screen and the voice recognition function when the time period calculated by the driven timer exceeds a predetermined time period and the eyeballs of the user are recognized; displaying, on the touch screen, a screen of the activated voice recognition function for receiving a voice input to control the voice recognition function of the wearable device; receiving the voice input through the activated voice recognition function; determining whether one or more functions executable by the received voice input include a user's personal information of the wearable electronic device; if the one or more functions executable based on the voice input do not include the user's personal information, analyzing the voice input by using the activated voice recognition function, and executing a function that does not include the user's personal information, based on the voice input; and if the one or more functions executable based on the voice input include the user's personal information of the wearable electronic device, outputting, through the activated touch screen, a message indicating that the one or more functions including the user's personal information are not executable, wherein the output message includes a function list of one or more functions that are executable by at least one voice input different from the received voice input and do not include the user's personal information.
1. A method of controlling a function of a wearable electronic device, comprising: detecting a predetermined gesture by a motion sensor of the wearable electronic device, for activating a voice recognition function of the wearable electronic device, wherein the wearable electronic device is worn on a wrist of a user; driving a timer for calculating a time period from an instance when the predetermined gesture is detected; recognizing eyeballs of the user through one or more cameras of the wearable electronic device; activating a touch screen and the voice recognition function when the time period calculated by the driven timer exceeds a predetermined time period and the eyeballs of the user are recognized; displaying, on the touch screen, a screen of the activated voice recognition function for receiving a voice input to control the voice recognition function of the wearable device; receiving the voice input through the activated voice recognition function; determining whether one or more functions executable by the received voice input include a user's personal information of the wearable electronic device; if the one or more functions executable based on the voice input do not include the user's personal information, analyzing the voice input by using the activated voice recognition function, and executing a function that does not include the user's personal information, based on the voice input; and if the one or more functions executable based on the voice input include the user's personal information of the wearable electronic device, outputting, through the activated touch screen, a message indicating that the one or more functions including the user's personal information are not executable, wherein the output message includes a function list of one or more functions that are executable by at least one voice input different from the received voice input and do not include the user's personal information. 3. The method of claim 1 , wherein the executed function which does not include the user's personal information includes one of Internet searches, call communication, map searches, broadcasts viewing, or news and weather information viewing, and is not interconnected with another function.