Bullshit, you're just lazy and don't want to try. You'd rather bug us here asking inane questions that are easily answered in the manual or PREVIOUS THREADS. Your question has been asked millions of times.
It's simple to erase the background from the character. Then overlay him on the background. THIS IS VERY BASIC COMPOSITING. It's VERY TIME CONSUMING. Photoshop, Premiere & After Effects all support Alpha channels. So load up your background, place it on track1, load up your character with his background erased, make sure you saved it as a PSD file, then place him on track2. Setup the Transperancy settings to Alpha Channel. Boom. Done.
Someone suggested the magic wand. Maybe you should LOOK IN THE HELP FILE AND FIND SOME INFORMATION ON IT:
Next time spend more than 2minutes trying to find the answer. You've already asked like 10questions in the past that are BASICS, that ARE COVERED IN DEPTH IN THE MANUAL. We are not YOUR MANUAL.
~klinky