Disclosed are a method and apparatus for a pulmonary function test, in which a pulmonary function is diagnosed based on vital capacity according to a breathing parameter of a subject and a thorax image according to impedance data, in which a conventional spirometer and electrical impedance tomography (EIT) are used together to collectively process and analyze a global variable obtained at a mouth of a subject and a local variable obtained from an image of an interior of a lung, thereby proposing spirotomometry.
