Disclosed is a technology for easy balancing between cells by securing a cell balance, using an optimization process adopting a radio parameter as a parameter of an objective function. Objective function extractor 11 sets up optimizing condition at least including an objective function that has a radio parameter of a base station as the objective function parameter and is used for an optimization process to balance traffic loads between cells, using cell balance values between a target cell whose characteristic changes by modification of the parameter and neighboring cells existing around the target cell. Optimizer 12 performs an optimization process in accordance with the optimizing condition set by objective function extractor 11 to determine the value of the parameter to be the solution.