time as compared with a control it is therefore considered that an obstructive pulmonary disease can be diagnosed by computing and outputting an inspiration time an expiration time fig6 is a view of a comparison between a copd patient and a healthy person of the inspiration time expiration time in quiet breathing state here the vertical axis represents an inspiration time expiration time an average value of 12 copd patient samples was 0 64 while an average value of 10 control samples was 0 85 and thus there is a significant difference with a p value p 0 0013 fig7 is a view of a comparison between before and after use of an inhalation of the inspiration time expiration time in quiet breathing state here the vertical axis represents an inspiration time expiration time the inspiration time expiration time before and after 6 to 12 weeks an intake of a bronchodilator tiotropium of 12 copd patients was 0 64 on average before use left side and 0 70 on average after use right side with a p value of p 0 106 an obvious increase in inspiration time expiration time due to a bronchodilator intake was thus recognized based on the above it is obvious that the inspiration time expiration time is meaningful as an indicator to diagnose an obstructive pulmonary disease as a matter of course this inspiration time expiration time can be provided as a stable indicator by averaging.