A wireless LAN communication device configured to carry out priority control of an EDCA scheme, the wireless LAN communication device comprising: a first determining means configured to determine access categories; a second determining means configured to determine a bandwidth occupancy rate for each access category; and a change means configured to dynamically change parameters regarding the priority control for each category in accordance with determination results of the first determining means and the second determining means; wherein, in a case where there are a plurality of categories to be determined by the first determining means, when the bandwidth occupancy rate determined by the second determining means is equal to or higher than a first bandwidth occupancy rate, the change means executes a first optimization, and in contrast, when the bandwidth occupancy rate determined by the second determining means is equal to or lower than the first bandwidth occupancy rate and equal to or higher than a second bandwidth occupancy rate, the change means executes a second optimization, and wherein the change means temporarily increases, at least, a CWmin and a CWmax of the parameters regarding the priority control only by a predetermined value α in the first optimization and the second optimization, and/or wherein in a case where there are no plurality of categories to be determined by the first determining means, when the bandwidth occupancy rate determined by the second determining means is equal to or higher than a third bandwidth occupancy rate, the change means executes a third optimization, and in contrast, when the bandwidth occupancy rate determined by the second determining means is equal to or lower than the third bandwidth occupancy rate and equal to or higher than a fourth bandwidth occupancy rate, the change means executes a fourth optimization, and wherein the change means temporarily increases, at least, a CWmin and a CWmax of the parameters regarding the priority control only by a predetermined value β in the third optimization and the fourth optimization. a first determining means configured to determine access categories; a second determining means configured to determine a bandwidth occupancy rate for each access category; and a change means configured to dynamically change parameters regarding the priority control for each category in accordance with determination results of the first determining means and the second determining means; wherein, in a case where there are a plurality of categories to be determined by the first determining means, when the bandwidth occupancy rate determined by the second determining means is equal to or higher than a first bandwidth occupancy rate, the change means executes a first optimization, and in contrast, when the bandwidth occupancy rate determined by the second determining means is equal to or lower than the first bandwidth occupancy rate and equal to or higher than a second bandwidth occupancy rate, the change means executes a second optimization, and wherein the change means temporarily increases, at least, a CWmin and a CWmax of the parameters regarding the priority control only by a predetermined value α in the first optimization and the second optimization, and/or wherein in a case where there are no plurality of categories to be determined by the first determining means, when the bandwidth occupancy rate determined by the second determining means is equal to or higher than a third bandwidth occupancy rate, the change means executes a third optimization, and in contrast, when the bandwidth occupancy rate determined by the second determining means is equal to or lower than the third bandwidth occupancy rate and equal to or higher than a fourth bandwidth occupancy rate, the change means executes a fourth optimization, and wherein the change means temporarily increases, at least, a CWmin and a CWmax of the parameters regarding the priority control only by a predetermined value β in the third optimization and the fourth optimization.