A mobile terminal, comprising: a display unit configured to display at least one content and a plurality of user interface, UI, objects having at least one voice name tagged thereto; a microphone; a user input unit; a memory; and a controller, characterized in that the controller is configured to: if one of the content and one of the UI objects are selected via the user input unit or the display unit being of a touchscreen type by dragging and dropping of one UI object to one content, by multi-touching one UI object and one content, or by long touching or double touching one UI object when only one content is displayed on the display unit, tag the voice name tagged to the selected UI object to the selected content; store the voice name tagged content in the memory; analyze a voice for a specific content search inputted via the microphone; search the memory for at least one content to which a voice name having a meaning associated with the analyzed voice is tagged; cause the display unit to display the searched at least one content, wherein prior to store the voice name tagged content in the memory, cause the display unit to display, in the selected content, an indicator indicating that the voice name tagged to the selected UI object is tagged to the selected content; when the indicator in the selected content is selected, convert the voice name tagged to the selected content to a text; and cause the display unit to display the converted text in the selected content instead of the indicator. a display unit configured to display at least one content and a plurality of user interface, UI, objects having at least one voice name tagged thereto; a microphone; a user input unit; a memory; and a controller, characterized in that the controller is configured to: if one of the content and one of the UI objects are selected via the user input unit or the display unit being of a touchscreen type by dragging and dropping of one UI object to one content, by multi-touching one UI object and one content, or by long touching or double touching one UI object when only one content is displayed on the display unit, tag the voice name tagged to the selected UI object to the selected content; store the voice name tagged content in the memory; analyze a voice for a specific content search inputted via the microphone; search the memory for at least one content to which a voice name having a meaning associated with the analyzed voice is tagged; cause the display unit to display the searched at least one content, wherein prior to store the voice name tagged content in the memory, cause the display unit to display, in the selected content, an indicator indicating that the voice name tagged to the selected UI object is tagged to the selected content; when the indicator in the selected content is selected, convert the voice name tagged to the selected content to a text; and cause the display unit to display the converted text in the selected content instead of the indicator. if one of the content and one of the UI objects are selected via the user input unit or the display unit being of a touchscreen type by dragging and dropping of one UI object to one content, by multi-touching one UI object and one content, or by long touching or double touching one UI object when only one content is displayed on the display unit, tag the voice name tagged to the selected UI object to the selected content; store the voice name tagged content in the memory; analyze a voice for a specific content search inputted via the microphone; search the memory for at least one content to which a voice name having a meaning associated with the analyzed voice is tagged; cause the display unit to display the searched at least one content, wherein prior to store the voice name tagged content in the memory, cause the display unit to display, in the selected content, an indicator indicating that the voice name tagged to the selected UI object is tagged to the selected content; when the indicator in the selected content is selected, convert the voice name tagged to the selected content to a text; and cause the display unit to display the converted text in the selected content instead of the indicator.