Combining several mini DVDs to one regular DVD

Does any one know an easy way to take several Mini DVDs onto one regular DVD. I have many Mini DVDs onto regular DVDs. I have a Sony Camcorder and I have about 20 mini DVDs. I want to place about 3 Mini DVDs on each regular DVD.

I am not that great with video and I only have the applications that come with the Mac.

Thanks

Rick