A mode controller for a vehicle, a method therefor, and a vehicle system are provided. The mode controller includes a screen configuration device that configures a touch input screen on a touch screen and a controller that detects a pattern of a touch input which is input through the touch input screen. A determination device compares the detected pattern of the touch input with a plurality of patterns which are previously defined for each mode to determine whether there is a pattern identical to the pattern of the touch input. A mode execution device executes a function of a mode defined in response to the pattern identical to the pattern of the touch input.