Hi Suahan,
The exercises and diet goes hand in hand. You need to do weight training exercises for stomach. Also, do a little bit of weight training exerises so as to tone up your stomach muscles. Fat from the stomach can be reduced by following exercises like reverse curls,scissors,crunches.Diet should also be taken care of.It should be overall low in saturated fats,fried foods,simple carbs and sugars,alcohol and red meat.