Provided are: a CO2 recovery apparatus such that the total operational efficiency and stability of the apparatus can be improved even when the amount of a gas to be treated varies; and a CO2 recovery process. This CO2 recovery apparatus (1) is provided with: a CO2 absorption tower (14) for bringing exhaust gas (11A) into contact with a CO2 absorbing liquid (13) and thus making the CO2 absorbing liquid (13) absorb the CO2 contained in the exhaust gas (11A); a CO2 absorbing liquid regeneration tower (15) for heating the CO2 absorbing liquid (13) with steam and thus releasing CO2 from the CO2 absorbing liquid (13) and regenerating the CO2 absorbing liquid (13); a flowmeter (101) for determining the flow rate of the exhaust gas (11A) introduced into the CO2 absorption tower (14); and a control unit (102) for classifying the flow rates of the exhaust gas (11A) determined by the flowmeter (101) into multiple flow rate ranges, and controlling the flow rate of the CO2 absorbing liquid (13) supplied to the CO2 absorption tower (14) and the flow rate of steam supplied to the CO2 absorbing liquid regeneration tower (15) on the basis of prescribed load set values which have been previously established in accordance with the multiple flow rate ranges.
