Mass spectrometer

A mass spectrometer capable of performing scan measurement, the mass spectrometer comprising:

• a provisional event time determining unit configured to determine a provisional event time to be assigned to a scan measurement event, which is a measurement unit for performing one scan measurement, in accordance with an analysis condition specified by a user;
• a scan speed selection unit configured to select a scan speed from a plurality of candidates such that a measurement time required for one scan measurement does not exceed the provisional event time of the scan measurement event;
• an event time determining unit configured to correct the provisional event time of the scan measurement event to a time required for scan measurement under the scan speed selected by the scan speed selection unit, and set the provisional event time that has been corrected as an event time of the scan measurement event;
• and
• a control information creation unit configured to create control information for controlling the mass spectrometer based on the event time determined by the event time determining unit.