Provided are a server device, a base station device, and an identification number establishment method, with which it is possible to avoid CRS interference between neighboring base stations, to improve downstream throughput, and to prevent a UE from erroneous cell selection. When a location information receiving unit (101) of an OAM (100) receives location information of a new eNB, a resource index establishment unit (104) selects a resource index (vshift) other than a resource index (vshift) which is used in an eNB which is neighboring to the new eNB. A cell ID computation unit (105) computes a cell ID from the selected resource index (vshift), and the computed cell ID is transmitted from a cell ID transmission unit (106) to the new eNB.