Mihans, the concept of being a buddha is a bit varied among different beliefs, but a buddha is a person who has achieved enlightenment. It is the goal of most buddhists. Buddha is not one person, but a type of person. In fact, there is the belief that there are (will be) a certain number of buddhas throughout time, and the next (who some have claimed to be) should be soon in coming.
Buddha is not a statue. The statues represent different Buddhas and beliefs about those individuals, and what they accomplished. A person (it is believed) can achieve the state through many, many years of meditation, study, and dedication.