How much would it cost to have an electrician move a TV from 1 side of the room to another?

I want to completely re-arrange my room. My TV is in the corner of the room, but I want it moved to the opposite wall. My mom said to do that, we would have to have an electrician come in and go inside the wall to move the cable wire to the opposite side so I can watch the TV there. You get what I mean? Does anyone know how much that would cost to have the TV moved, cables and all? Has anyone ever done that before?