Gas analyzing method, and gas analyzing system

A gas analyzing system comprising:

• a sensor that outputs a signal responsive to molecular adsorption;
• an exposer that exposes the sensor to a sample gas in a measurement period including a first period, a second period following the first period, and a third period following the second period, under a condition where a molecule contained in the sample gas is more readily adsorbed to the sensor in the second period than in the first period and the third period;
• an obtainer that obtains the signal outputted from the sensor in the measurement period;
• a selector that divides at least one of the second period or the third period into a plurality of divided sections, and selects, as at least one extraction section, a part of the plurality of divided sections;
• an extractor that extracts at least one feature of the signal outputted in the at least one extraction section;
• a memory that stores a pre-trained logical model for one of qualitative determination or quantitative determination of the molecule contained in the sample gas;
• and
• an analyzer that performs, using the pre-trained logical model, one of qualitative analysis or quantitative analysis on the molecules contained in the sample gas, based on only the at least one feature extracted by the extractor among features of the signal in the measurement period, and outputs an analysis result of the one of qualitative analysis or quantitative analysis.