A practice on learn-by-doing career education programs has been operated in Faculty of Engineering in Niigata University from 2006. The purpose of the activity is reduction of early unemployment which is due to the gaps between the situations which university students would expect in their job hunting processes and those of their practical work places after getting jobs. We developed a novel internship program to let the students notice the practical situations of engineers outside the university. A major part of the program is composed of two different kinds of internships and what we call a career design workshop. The characteristic programs are called "Market Internship" and "Technology Internship". In the activities, they are organically connected with each other. In the paper we refer to one of the unique internship programs "Technology Internship", which is characterized as a longer-term practice than usual. In the course of one-month internship practices, the students obtained deeper understandings and closer relationship to the practical work places of the companies than usual internships which last less than two weeks. The students estimated these unique experiences effective for their job hunting in near future.