Plum and Apple tree advice please

Hello, I have two extremely fruit laden trees, one plum and one apple. I do not know the variety of either but they both have nice tasty fruit. My problem is this however, both trees but especially the apple seem too spindly to support the weight of the fruit, the branches are really thin and generally the tree looks sorry for itself, pretty bare axcept for the fruit
The branches ar touching the floor with the fruit.
The plum tree is also weighted down to the floor but not quite as bad as the apple.
Both trees need to strengthen up and not look weedy. I have tried reading "how to prune" but the images dont seem to look like my trees. They are each about 4 years old and this is the first real crop i have ever had.
Where should I go from here? bearing in mind the trees are still full of fruit.
Any advice will be greatly appreciated.
Thank you

 

Addition to the above, I went into the garden this morning and the top 3 foot had given way so I now have my first big bag of apples but the tree still has plenty more onboard.
Obviously i cut the broken bit off cleanly but still have no idea what to do with the rest of the tree.

 

Hi Speedbird1

Is there any chance you can post some pictures of your trees? Fruit trees, especially apple, fall into two fruit-position catagories: spur bearing and tip bearing. Spur bearers grow their fruit along the length of the branch, whilst tip bearers grow their fruit on the tip. Usually there is a different approach as to how the tree is best pruned, depending on if it is tip or spur bearing.

There's some good general advice here: Fruit tree pruning - Wikipedia, the free encyclopedia

 

Thanks for the replies so far:

I will try to get photos but the apple is not tip type, it has apples in little bunches along its branch length.

Its height of the central trunk is now about 5 foot with a diameter of a cotton reel and spindly long branches about 4ft long.
Hope this helps

 

Plum Tree

I too have a Victoria plum tree that has been overladen with fruit and 4 branches have snapped off.

I was advised to strip half of the fruit off which I did but the wind and rain damaged it further. I did manage to support some branches with poles and rope .

Its now looking a bit sorry for itself and I do not know what to do with it. There is still fruit on it.

Liz7zy