An apparatus and method in a wireless communication system. The apparatus includes a dynamic network planning trigger unit and a master user equipment selecting unit. The dynamic network planning trigger unit triggers, based on a predetermined trigger event, a dynamic network planning in an area managed by the apparatus. The dynamic network planning includes selection of a master user equipment used for device-to-device communication, and the master user equipment receives signals from a base station during the device-to-device communication process and relays signals between the base station and a slave user equipment. The master user equipment selecting unit selects, from user equipment in the area according to quality of channels between the user equipment and the base station, one or more user equipment as master user equipment, distances between the master user equipment being greater than the intervals.