A liquid crystal display, applying to the first electrode, a voltage higher and a voltage lower at different timings, detecting a current flowing through the second electrode, designating, as a reference value, the current flowing through the second electrode when the voltage maintained in the liquid crystal element is reset, specifying a first current which is obtained by excluding a charging current due to application of a related higher voltage from currents flowing through the second electrode after the higher voltage is applied to the first electrode, and a second current which is obtained by excluding a charging current due to application of a related lower voltage from currents flowing through the second electrode after the lower voltage is applied to the first electrode, and comparing the first current with the second current, and controlling the first current and the second current based on the comparison result.