A control method of controlling an input to a motor incorporated in an injection molding machine, said motor being driven in accordance with a setting pattern of a plurality of levels in which a setting value stepwisely changes, said control method comprising: setting a setting value for an output of the motor to be held for a predetermined setting time so as to create the setting pattern; setting a reduction ratio or a plurality of reduction ratios to reduce the setting value in accordance with passage of time; creating a reduction setting pattern by applying the reduction ratio or the plurality of reduction ratios to the plurality of levels, each reduction ratio being set to reduce an electric power consumed by the motor in excess of the setting value, the reduction ratio being applied in at least one of a manner such that the setting pressure starts to decrease at the time of start of the pressure holding, and reaches a predetermined pressure (Pa) at a pressure holding completion time, and a manner such that the setting pressure starts to decrease at a predetermined time (Ta) after the start of the pressure holding, and reaches a next setting pressure at the pressure holding completion time; the plurality of reduction ratios being applied such that the setting pressure starts to decrease from the predetermined time (Ta) and reaches the predetermined pressure (Pa) at the pressure holding completion time; and controlling the input to said motor based on the reduction setting pattern, wherein when a plurality of values are set as said setting value in accordance with passage of time, an input to said motor corresponding to each of the plurality of values is reduced at the same reduction ratio or reduction ratios different from each other or a combination thereof. setting a setting value for an output of the motor to be held for a predetermined setting time so as to create the setting pattern; setting a reduction ratio or a plurality of reduction ratios to reduce the setting value in accordance with passage of time; creating a reduction setting pattern by applying the reduction ratio or the plurality of reduction ratios to the plurality of levels, each reduction ratio being set to reduce an electric power consumed by the motor in excess of the setting value, the reduction ratio being applied in at least one of a manner such that the setting pressure starts to decrease at the time of start of the pressure holding, and reaches a predetermined pressure (Pa) at a pressure holding completion time, and a manner such that the setting pressure starts to decrease at a predetermined time (Ta) after the start of the pressure holding, and reaches a next setting pressure at the pressure holding completion time; the plurality of reduction ratios being applied such that the setting pressure starts to decrease from the predetermined time (Ta) and reaches the predetermined pressure (Pa) at the pressure holding completion time; and the reduction ratio being applied in at least one of a manner such that the setting pressure starts to decrease at the time of start of the pressure holding, and reaches a predetermined pressure (Pa) at a pressure holding completion time, and a manner such that the setting pressure starts to decrease at a predetermined time (Ta) after the start of the pressure holding, and reaches a next setting pressure at the pressure holding completion time; a manner such that the setting pressure starts to decrease at the time of start of the pressure holding, and reaches a predetermined pressure (Pa) at a pressure holding completion time, and a manner such that the setting pressure starts to decrease at a predetermined time (Ta) after the start of the pressure holding, and reaches a next setting pressure at the pressure holding completion time; the plurality of reduction ratios being applied such that the setting pressure starts to decrease from the predetermined time (Ta) and reaches the predetermined pressure (Pa) at the pressure holding completion time; and controlling the input to said motor based on the reduction setting pattern, wherein when a plurality of values are set as said setting value in accordance with passage of time, an input to said motor corresponding to each of the plurality of values is reduced at the same reduction ratio or reduction ratios different from each other or a combination thereof.