In recent years, many WBT systems have been proposed and developed by the progress of computer networks. However, there have been a few WBT systems treating experiments and training. Therefore, our laboratory developed WBT system for logic circuit experiments. The WBT system has problems in instruction using a chat. Since the instructor always needs to monitor the student's wiring state, instructor's burden is heavy. Students and the instructor have to share the time for chat instruction. In order to perform more efficient study, the WBT system needs the environment that students can progress study without the instructor. The tutoring function instructs students instead of the instructor by appropriate advice using the student's wiring state. The tutoring function always monitors the student's wiring state. When the wiring state changes, the advice suitable for the wiring state is searched from the database, and searched advice sends to the student. There are two kinds of advice for the tutoring function, the advice prepared beforehand and the advice automatically generated from the chat log. The advice automatically generated from the chat log increases in proportion to the number of chat instructions. We implement the tutoring function, and evaluate the WBT system.