Your most immediate and best option is to combine aerobic exercise and exercise involving lifting weights, as you will not only burn body fat but tone your muscles as well, positively changing your hip to waist ratio, and working quickly towards a healthier body in ever aspect. As you burn belly fat, you'll burn fat where it doesn't need to be elsewhere, too!
There's no way around the fact that, when it comes to burning more fat, you have to work at it. There is no magic exercise, workout, or pill that will do the job for you. The good news is that it doesn't take much activity to push the body into that fat burning mode. Try incorporating some type of activity every day, even if it's just a quick walk, and build on that over time as it becomes more of a routine. Do that and you're on the way to burning more fat.