Aerosol generating device and method for controlling same

An aerosol generating device comprising:

• a case into which a cigarette is to be inserted;
• a cap detachably coupled to a top portion of the case;
• a cover configured to move on a top surface of the cap, thereby opening or closing a cigarette insertion hole;
• a first sensor configured to sense whether the cigarette insertion hole is open or closed;
• a heater arranged in the case and configured to heat the cigarette inserted into the case;
• a button;
• and
• a controller configured to determine whether the cigarette insertion hole is open or closed based on a signal sensed by the first sensor,
• characterized in that the controller is configured to:
• determine whether the button is pressed as a first input for a predetermined first time period based on the cigarette insertion hole being open, and
• control power to be supplied to the heater such that the heater is pre-heated in response to the first input, wherein power is not supplied to the heater in response to the button being pressed when the cigarette insertion hole is closed such that pre-heating is not performed when the cigarette insertion hole is closed,
• wherein the controller is further configured to perform a reset operation of the aerosol generating device based on a second input received via the button for a predetermined second time period.