The rating systems are important to find the quality of the product or service. These rating systems serve as a guide in finding the perfect one based on different user criteria. Therefore, a sentiment analysis system has been designed for automatic restaurant rating which will be useful to the people in picking their favorite restaurant. The sentiment analysis for restaurant rating system rates the restaurant depending upon the reviews given by the users. The system breaks user comments to check for sentiment keywords. Once the keywords are found, it associates the comment with a sentiment rank. Sentiment analysis can also be extended further to improve the business process. With the customers' reviews, one can understand the changes in the market and improve their product/service. It is also scalable to any type of environment.