A control method of a refrigerator , the refrigerator comprising a cabinet having a storage compartment for storing food therein, a door for opening and closing the storage compartment, an evaporator placed in the storage compartment, a temperature sensor for measuring a temperature inside the storage compartment, a compressor having a variable speed, and a compressor controller for controlling an operation of the compressor via the temperature sensor, the control method comprising: a first step (S100) of operating the compressor; a second step of terminating the operation of the compressor when the temperature measured by the temperature sensor in the first step reaches a set temperature; a third step of performing the first step and the second step during a plurality of cycles; a fourth step of measuring a compressor operation time and a total time of the cycles while the cycles are performed in the third step; a fifth step (S150) of calculating an operation rate by dividing the compression operation time by the total time; a sixth step of comparing the operation rate calculated in the fifth step with a set value; and a seventh step (S200) of adjusting a Revolutions Per Minute (RPM) of the compressor based on the comparative result of the sixth step, characterized in that : the set value includes a first set value and a second set value, the RPM of the compressor is increased in the seventh step (S210, S220) when the operation rate is greater than the first set value, and is reduced in the seventh step (S250, S260) when the operation rate is less than the second set value, and the first set value is greater than the second set value. a first step (S100) of operating the compressor; a second step of terminating the operation of the compressor when the temperature measured by the temperature sensor in the first step reaches a set temperature; a third step of performing the first step and the second step during a plurality of cycles; a fourth step of measuring a compressor operation time and a total time of the cycles while the cycles are performed in the third step; a fifth step (S150) of calculating an operation rate by dividing the compression operation time by the total time; a sixth step of comparing the operation rate calculated in the fifth step with a set value; and a seventh step (S200) of adjusting a Revolutions Per Minute (RPM) of the compressor based on the comparative result of the sixth step, characterized in that : the set value includes a first set value and a second set value, the RPM of the compressor is increased in the seventh step (S210, S220) when the operation rate is greater than the first set value, and is reduced in the seventh step (S250, S260) when the operation rate is less than the second set value, and the first set value is greater than the second set value. the set value includes a first set value and a second set value, the RPM of the compressor is increased in the seventh step (S210, S220) when the operation rate is greater than the first set value, and is reduced in the seventh step (S250, S260) when the operation rate is less than the second set value, and the first set value is greater than the second set value. <EOS>