A communication control method for controlling a handover of a mobile terminal in a communication system including first and second radio base stations (100, 103), in which an attribute value is defined for each radio base station, the attribute value being a parameter for controlling a handover to an adjacent cell, the communication control method comprising: transmitting, by the second radio base station adjacent to the first radio base station, an information element including information about the attribute value relating to a second cell to the first radio base station, the second cell being under control of the second radio base station; receiving, by the first radio base station, the information element including the information about the attribute value relating to the second cell; comparing, by the first radio base station, a first temporary attribute value with a second temporary attribute value, the first temporary attribute value being information about the attribute value of a first cell, the second temporary attribute value being information about the attribute value of the second cell included in the information element, the first cell being under control of the first radio base station; and executing, by the first radio base station, processing for matching a first actual attribute value with a second actual attribute value in accordance with a predetermined criterion, when the received second temporary attribute value of the second cell is different from the first temporary attribute value of the first cell, the first actual attribute value being information about the attribute value of the first cell and used for actual handover control, the second actual attribute value being information about the attribute value of the second cell and used for actual handover control. transmitting, by the second radio base station adjacent to the first radio base station, an information element including information about the attribute value relating to a second cell to the first radio base station, the second cell being under control of the second radio base station; receiving, by the first radio base station, the information element including the information about the attribute value relating to the second cell; comparing, by the first radio base station, a first temporary attribute value with a second temporary attribute value, the first temporary attribute value being information about the attribute value of a first cell, the second temporary attribute value being information about the attribute value of the second cell included in the information element, the first cell being under control of the first radio base station; and executing, by the first radio base station, processing for matching a first actual attribute value with a second actual attribute value in accordance with a predetermined criterion, when the received second temporary attribute value of the second cell is different from the first temporary attribute value of the first cell, the first actual attribute value being information about the attribute value of the first cell and used for actual handover control, the second actual attribute value being information about the attribute value of the second cell and used for actual handover control.