An air-conditioning unit control device that is adapted to control an air-conditioning unit system including one or more outdoor units and a plurality of indoor units connected to the outdoor units by pipes, the indoor units being configured to condition air in a space, the air-conditioning unit control device comprising: - an environment target value setting unit configured to set an environment target value for an environment intended to be achieved by air conditioning through each of the indoor units, said air-conditionig unit control device further comprising: - a zone setting unit configured to form one or more groups of the indoor units and set a zone serving as a subspace for each of the groups based on a difference between each environment target value and each environment-condition-related value detected by an indoor environment condition detecting means in an installation position for each of the indoor units, the zone setting unit also configured to change the zone based on a difference between each environment target value and each environment-condition-related value; - a zone load calculating unit configured to calculate a heat load on the zone set or changed by the zone setting unit based on a difference between each environment target value and each environment-condition-related value; - an air conditioning capacity allocation calculating unit configured to calculate and determine an allocation of operation capacity to each of the indoor units and the outdoor units based on power consumption of each of the indoor units and the outdoor units so as to minimize the total power consumption; and - a control instructing unit configured to transmit a control signal based on the operation capacity of each of the indoor units and the outdoor units calculated by the air conditioning capacity allocation calculating unit to each of the indoor units and the outdoor units. - an environment target value setting unit configured to set an environment target value for an environment intended to be achieved by air conditioning through each of the indoor units, said air-conditionig unit control device further comprising: - a zone setting unit configured to form one or more groups of the indoor units and set a zone serving as a subspace for each of the groups based on a difference between each environment target value and each environment-condition-related value detected by an indoor environment condition detecting means in an installation position for each of the indoor units, the zone setting unit also configured to change the zone based on a difference between each environment target value and each environment-condition-related value; - a zone load calculating unit configured to calculate a heat load on the zone set or changed by the zone setting unit based on a difference between each environment target value and each environment-condition-related value; - an air conditioning capacity allocation calculating unit configured to calculate and determine an allocation of operation capacity to each of the indoor units and the outdoor units based on power consumption of each of the indoor units and the outdoor units so as to minimize the total power consumption; and - a control instructing unit configured to transmit a control signal based on the operation capacity of each of the indoor units and the outdoor units calculated by the air conditioning capacity allocation calculating unit to each of the indoor units and the outdoor units. - a zone setting unit configured to form one or more groups of the indoor units and set a zone serving as a subspace for each of the groups based on a difference between each environment target value and each environment-condition-related value detected by an indoor environment condition detecting means in an installation position for each of the indoor units, the zone setting unit also configured to change the zone based on a difference between each environment target value and each environment-condition-related value; - a zone load calculating unit configured to calculate a heat load on the zone set or changed by the zone setting unit based on a difference between each environment target value and each environment-condition-related value; - an air conditioning capacity allocation calculating unit configured to calculate and determine an allocation of operation capacity to each of the indoor units and the outdoor units based on power consumption of each of the indoor units and the outdoor units so as to minimize the total power consumption; and - a control instructing unit configured to transmit a control signal based on the operation capacity of each of the indoor units and the outdoor units calculated by the air conditioning capacity allocation calculating unit to each of the indoor units and the outdoor units.