The number of jobless graduates has become one of the serious problems existing both in the developing and developed countries, today. The Internet has changed the way of looking for jobs, through the development of an online job search system. A job search system is a kind of web application that provides an efficient way of searching the Internet or the web for job types available. Finding jobs that best suits the interests and skill set is quite a challenging task for job seekers. This paper proposes an online job advertisement search system that is the solution where the employers, as well as the job seekers, meet aiming at fulfilling their individual requirements. The main purpose of proposed system is to offer and provide different job types for the job seekers based on their preferred criteria. The system administrator will collect the suitable facts (qualifications, salary, age, etc.) of job positions. Then, this system will build decision tree for the job types to generate decision rules by using J48 algorithm. Finally, this system will display suitable job types for job seekers provided by employers.