More and more researchers emphasize the importance of teachers' roles in technology-enhanced digital classroom, especially when the classroom mode is transformed from teacher-led instruction to student-centered learning. In such digital classroom environment, it is significant for teachers to understand students' learning statuses at any moment, and further offer adaptive assistants to students. Therefore, in this paper, we propose a three-level mechanism for profile utilization in a digital classroom supporting system, named DCE, to help teachers understand students' learning status, including keeping track of students' learning progress for praise/alert message, help seeking, and misconception diagnosis. Through the three-level real-time supporting system, teachers' role can be changed from "monitor" to "mentor", which provides students with adequate assistants to benefit their classroom learning. A preliminary experiment was conducted, and the results revealed that teachers showed positive perceptions on such mechanism design.