An inkjet printing apparatus is provided that can establish a test pattern detection region according to the printing format, where performing printing by way of a margined printing and a marginless printing is possible. The inkjet printing apparatus detects the position of both ends of the test pattern. In the case of a margined printing, a detection of the ink ejection status is performed with respect to ejection ports that perform printing at a region between both ends of the margined test pattern, and that eject the ink forming the pixels of the margined test pattern. In the case of a marginless printing, a detection of the ink ejection status is performed with respect to ejection ports that perform printing at a region between both ends of the marginless test pattern, and that eject the ink forming the pixels of the marginless test pattern.