You could add the fallen fruit to the compost heap as and when they fall. Doing this would supply nitrogen as a ‘green’ material to the mix. However, in late summer or autumn, there may be a larger amount of fruit to incorporate in the mix. If this is the case, adding them all to the heap can add too much nitrogen, and therefore slow down the process and lead to a mushy consistency. Something you don’t really want.
So, what I suggest is to create a balance by adding brown materials like straw, cardboard, shredded paper, and fallen brown leaves. This can be added with a layer of apples, then a layer of carboard and repeated. It’s a tiered compost cake if you like. With this approach it’s ideal to cut the apples and the cardboard into smaller pieces which will help the materials breakdown more easily and encourage the compost process along.
Unless you are starting your own brewery, don’t let the fruit ferment in my example, apples, ferment or produce an unpleasant aroma. A compost recipe of one-part apples to two-part brown material will reduce the likelihood of this happening.