A method of manufacturing a semiconductor device, includes: loading a substrate including a laminated film including an insulating film and a sacrificial film, a channel hole formed in the laminated film, a charge trapping film formed on a surface in the channel hole, a first channel film formed on a surface of the charge trapping film, and a common source line exposed on the bottom of the channel hole; receiving information on a distribution of hole diameter of the channel hole; and forming a second channel film on a surface of the first channel film by supplying a first processing gas and a second processing gas to a center side and an outer peripheral side of the substrate, respectively, so as to correct the distribution of the hole diameter based on the information.