Many thanks for all your suggestions and safety precaution.
I managed to use tweezer to slowly and hold tight on the tip of tweezer to pull out gently without damaging the terminal (the broken banana plug tip was split in loose, so use tweezer to grab the short piece and pull. (The tweezer is with anti-static tip, used to pick screw from PCBs)
From the bad experience of banana plugs, I would use spades type speaker cable instead next time.