An operation control device comprising: a data storage unit to store a plurality of weather change patterns as a pattern of how weather changes, and store a plurality of control plans as a plan for controlling an operation of an air conditioning equipment in accordance with the plurality of weather change patterns, respectively; a plan selection unit to determine, at a time point midway through a time zone where the operation of the air conditioning equipment is controlled along one control plan among the plurality of control plans stored in the data storage unit, whether a weather change pattern corresponding to the one control plan deviates from an actual weather change pattern, based on weather data indicating a time-series weather observation result of up to the time point; if deviates, select a weather change pattern that is different from the weather change pattern corresponding to the one control plan, from among the plurality of weather change patterns stored in the data storage unit, in accordance with the weather data; and during a rest of the time zone, control the operation of the air conditioning equipment along a control plan corresponding to the different weather change pattern, among the plurality of control plans; and a plan formulation unit to formulate the plurality of control plans in accordance with a target value of power consumption of the air conditioning equipment in the time zone, and store the plurality of control plans to the data storage unit, wherein the plan selection unit, when selecting the different weather change pattern, specifies, from among the plurality of control plans, a control plan according to which a prediction value of power consumption of the air conditioning equipment during the rest of the time zone exceeds a difference between the target value and an actual value of power consumption of the air conditioning equipment of up to the time point, and excludes a weather change pattern corresponding to the specified control plan from candidates. a data storage unit to store a plurality of weather change patterns as a pattern of how weather changes, and store a plurality of control plans as a plan for controlling an operation of an air conditioning equipment in accordance with the plurality of weather change patterns, respectively; a plan selection unit to determine, at a time point midway through a time zone where the operation of the air conditioning equipment is controlled along one control plan among the plurality of control plans stored in the data storage unit, whether a weather change pattern corresponding to the one control plan deviates from an actual weather change pattern, based on weather data indicating a time-series weather observation result of up to the time point; if deviates, select a weather change pattern that is different from the weather change pattern corresponding to the one control plan, from among the plurality of weather change patterns stored in the data storage unit, in accordance with the weather data; and during a rest of the time zone, control the operation of the air conditioning equipment along a control plan corresponding to the different weather change pattern, among the plurality of control plans; and a plan formulation unit to formulate the plurality of control plans in accordance with a target value of power consumption of the air conditioning equipment in the time zone, and store the plurality of control plans to the data storage unit, wherein the plan selection unit, when selecting the different weather change pattern, specifies, from among the plurality of control plans, a control plan according to which a prediction value of power consumption of the air conditioning equipment during the rest of the time zone exceeds a difference between the target value and an actual value of power consumption of the air conditioning equipment of up to the time point, and excludes a weather change pattern corresponding to the specified control plan from candidates.