i have lost 15 kg in 1 year then not lossing further i need to lose more 5 kg to near my ideal wt.

That's OK if you can't go to the gym - here are some things to explore:

1- Is your diet reflecting the weight loss - if you are "physically smaller" you may need to cut down on calories - even if the plan worked till now.  consider dropping 1 carbohydrate serving, some of the healthy fat servings (I hope you are eating) - ad one fruit snack serving to balance out those calories lost

2- Buy 3 sets of hand weight  - maybe 3 , 5, 8 pounds.  Invest in some weight training DVDs or go online for some basic weight training programs.  Adding on muscle mass will help to rev up your metabolism and help you to nudge the weight

3- Within your walking hour - add some hills and valleys and pick up the pace - you do need to raise your heart rate to burn calories, especially when your body is accustomed to the current walking program.

I did this too...it's known as a "plateau" stage. It will pass, but here's how I got over mine.

1) take a look at everything you're eating. Hidden calories can add up, so maybe a little less creamin your tea, or a bit less cereal for breakfast?

2) Try upping your exercise level to 1 1/2 hours a day. Maybe a brisk walk before dinner. Or, you can increase your pace. Walking at a slightly faster pace can burn more calories.

Make everyday activities into mini exercises. Climb stairs, swing your arms while walking, walk farther to the grocery store, etc.

Before you know it, you'll be at your goal!