An ISG (Idle Stop and Go) display device of an ISG vehicle may include a driving information detecting unit that detects driving information of the vehicle, a memory unit that stores notification about ISG of the vehicle, a control unit that executes the ISG and detects situations of an operation and an abnormality of the ISG by using the driving information of the vehicle which may be input from the driving information detecting unit, and receives the notifications about the ISG which correspond to the situations from the memory unit, and a display unit that may be controlled by the control unit to display the notifications about the ISG in accordance with the situations.