When the vehicle is traveling on an uphill road (step 100: YES), the ECU executes a program in which, if the speed of the vehicle is equal to or higher than Vblt (step 102: NO) and a speed ratio .gamma.(1) required to secure a sufficient climbing capacity of the vehicle is equal to or lower than a speed ratio .gamma.(2) required to secure a sufficient returnability of the belt of the continuously variable transmission (step 106: NO), a belt returnability securing control is executed (step 110), and otherwise (step 102: YES or step 106: YES), a climbing control is executed (step 104 or step 108).