A controller includes a temperature prediction unit. The temperature prediction unit predicts, on the assumption that a refrigerant is fed from a refrigerant feeder, an internal temperature of a column oven based on time interval information and decrement information in a memory. Thus, the temperature prediction unit can accurately predict the internal temperature of the column oven when the refrigerant is fed from the refrigerant feeder. If the refrigerant is fed from the refrigerant feeder when the predicted internal temperature of the column oven is suitable for the analysis operation, the internal temperature of the column oven can be brought closer to an appropriate temperature. As a result, the internal temperature of the column oven can be controlled with precision.