The 21st century works need both 'hard' skills (traditional domains, such as, history, mathematics, science) as well as 'soft' skills (teamwork, disciplined thinking, creativity, social skills, computer literacy and analyze information). KIT and ICT have committed to on-line PBL education to educate students on the skills they need. Accurately grasping the learning situation of each student and promoting his growth by giving appropriate advice is effective for student's growth, and AI can be utilized to achieve this. We propose the on-line PBL education system using AI. Especially, a past activity case presentation system using AI is explained in detail.