An integrated laundry treatment apparatus comprising: a cabinet having a common accommodation space therein; a first laundry treatment module disposed at an upper side in the common accommodation space; a second laundry treatment module disposed at a lower side in the common accommodation space; a common drying module configured to produce hot air and supply the hot air to the first laundry treatment module and the second laundry treatment module through a first outlet (5 1c) and a second outlet, the common drying module being configured to absorb at least a part of moisture contained in hot air recovered from the first laundry treatment module and the second laundry treatment module through a first inlet and a second inlet; an outlet flow path switching valve configured to selectively open at least any one of the first outlet and the second outlet or simultaneously open the first outlet and the second outlet (5 1d); an inlet flow path switching valve configured to selectively open at least any one of the first inlet and the second inlet or simultaneously open the first inlet and the second inlet; a first humidity sensor configured to measure a first humidity of the hot air recovered through the first inlet (5 1a); a second humidity sensor configured to measure a second humidity of the hot air recovered through the second inlet; and a control unit electrically connected to the first humidity sensor and the second humidity sensor and configured to produce a control signal for operating the outlet flow path switching valve and the inlet flow path switching valve, wherein the control unit is configured to receive a signal related to the first humidity measured by the first humidity sensor and a signal related to the second humidity measured by the second humidity sensor while the hot air is simultaneously supplied to the first laundry treatment module and the second laundry treatment module, and wherein the control unit is configured to calculate a difference value between the first humidity and the second humidity when the control unit determines that both the first humidity and the second humidity exceed a predetermined target humidity, and when the difference value exceeds a predetermined critical value, the control unit is configured to operate the outlet flow path switching valve to change opening degrees of the first and second outlets (51c, 51d). a cabinet having a common accommodation space therein; a first laundry treatment module disposed at an upper side in the common accommodation space; a second laundry treatment module disposed at a lower side in the common accommodation space; a common drying module configured to produce hot air and supply the hot air to the first laundry treatment module and the second laundry treatment module through a first outlet (5 1c) and a second outlet, the common drying module being configured to absorb at least a part of moisture contained in hot air recovered from the first laundry treatment module and the second laundry treatment module through a first inlet and a second inlet; an outlet flow path switching valve configured to selectively open at least any one of the first outlet and the second outlet or simultaneously open the first outlet and the second outlet (5 1d); an inlet flow path switching valve configured to selectively open at least any one of the first inlet and the second inlet or simultaneously open the first inlet and the second inlet; a first humidity sensor configured to measure a first humidity of the hot air recovered through the first inlet (5 1a); a second humidity sensor configured to measure a second humidity of the hot air recovered through the second inlet; and a control unit electrically connected to the first humidity sensor and the second humidity sensor and configured to produce a control signal for operating the outlet flow path switching valve and the inlet flow path switching valve, wherein the control unit is configured to receive a signal related to the first humidity measured by the first humidity sensor and a signal related to the second humidity measured by the second humidity sensor while the hot air is simultaneously supplied to the first laundry treatment module and the second laundry treatment module, and wherein the control unit is configured to calculate a difference value between the first humidity and the second humidity when the control unit determines that both the first humidity and the second humidity exceed a predetermined target humidity, and when the difference value exceeds a predetermined critical value, the control unit is configured to operate the outlet flow path switching valve to change opening degrees of the first and second outlets (51c, 51d).