An apparatus and a method for displaying a cluster are provided. The apparatus includes a driving sensor that senses a driving state of a mobile object and a display unit that converts a method of displaying a cluster indisposed within the mobile object. A controller is configured illuminate a scale and a pointer that indicates the scale based on the sensed driving state of the mobile object. In addition, the controller detects a current driving state of the mobile object in real time to generate a control signal with respect to the display method including a brightness degree, a brightness region, and a color of the scale.