Embodiments of the present invention disclose terminal device, a base station, and communications methods of the terminal device and the base station. In the embodiments of the present invention, information about amounts of to-be-transmitted data of different D2D communications groups may be reported to a base station, so that the base station can separately schedule data for the different communications groups. The information about the amount of the to-be-transmitted data includes identification information of the currently-enabled communications group, and a buffer status report of a logical channel group corresponding to the currently-enabled communications group.