An annotation-based classroom activities support environment with home network technology is proposed. The environment includes digital appliances, mobile devices, and PCs to facilitate a face-to-face class. The resulting system enables the sharing and playing of learning contents among the teacher and students in the class. The teacher and students can annotate the learning contents without file operation to share. In addition, the system operates devices on a network to support a class and has a user management feature. The system design and the prototype under development are described.