Facial hair does NOT grow back faster, or thicker or anything else. I would suggest you shave it. You can however, tweeze it with tweezers. Most people affected with a unibrow usually have a hairdresser wax them, that way they are usually more even.
Do NOT shave. It does grow back thicker and faster despite what some people think. The easiest (and least painful in my opinion) is waxing. You can get it done by a professional, or if this is too embarrassing, they have waxing kits at walmart.