A gas oven and a control method thereof are The control method of the gas oven, that includes a cooking space that is divided into a first cooking space and a second cooking space by a removable divider, a burner that directly heats a cooked object accommodated in the first cooking space, and an auxiliary heater that heats air of the first cooking space, includes performing baking for the first cooking space when a baking mode for the first cooking space is selected among a plurality of cooking modes, wherein the baking may include operating the burner according to the comparison result of a temperature of the first cooking space and a first setting temperature, and operating the auxiliary heater according to the comparison result of the temperature of the first cooking space and a second setting temperature.
