Disclosed is an aerosol generating device including a heater that heats an aerosol generating material and a controller that controls power to be supplied to the heater. The controller calculates a first power amount indicating a power amount used by the heater during a preset first time period after a heating operation of the heater is started, and controls the heating operation of the heater based on whether the first power amount is greater than or equal to a preset reference power amount.
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