1. A mobile terminal, comprising: a memory configured to store at least one touch gesture to which a specific function is assigned; a touchscreen having a screen configured to receive the at least one touch gesture; and a controller configured to: control the touchscreen to display a trajectory line of the received at least one touch gesture on a background within the screen such that the trajectory line can be discriminated from other information displayed on the screen, the trajectory line displayed either by displaying the trajectory line more prominently than the background by changing a color of the background to a color other than white that is different than a color of the trajectory line or by displaying the background semi-transparently search the memory for the specific function assigned to the at least one touch gesture; and execute the assigned specific function.