This disclosure relates to a terminal device, a network device, a method of cell selection, and a wireless communications system. In the method of cell selection, a terminal device sends cell information of at least one cell in a first wireless communications system to a second network device in a second wireless communications system, so that the second network device can select a target cell in the first wireless communications system, and the terminal device accesses the target cell selected by the second network device, and accesses a core network in the first wireless communications system by using a first network device to which the target cell belongs. The terminal device provides the cell information, and the second network device selects the target cell. This implements cell selection in the future evolved first wireless communications system.