An energy conservation controller, comprising: a storage unit configured to previously store a plurality of control contents for an apparatus to be controlled (1, 11, 12, 13), corresponding to a plurality of energy conservation levels that indicate degrees of energy conservation, respectively; a setting unit configured to set an energy conservation level; a control unit configured to refer to the storage unit, and then control the apparatus to be controlled (1, 11, 12, 13), based on a control content corresponding to the energy conservation level that has been set in the setting unit; a request acquisition unit configured to define, as a reference time point, a time point when the control unit starts to control the apparatus to be controlled (1, 11, 12, 13) based on the control content, the request acquisition unit being configured to acquire an operation content performed by a user for control of the apparatus to be controlled (1, 11, 12, 13) within a predetermined time period of at least one of before and after the reference time point; and an acceptability evaluation unit configured to evaluate, as a degree of acceptance, a degree of the user's acceptability to control performed by the control unit at the reference time point, based on the operation content that has been acquired by the request acquisition unit, wherein the setting unit is configured to, when the degree of acceptance is higher than a first threshold value, change the energy conservation level so that energy to be consumed in the apparatus to be controlled (1, 11, 12, 13) is made smaller than energy that has been consumed in the apparatus to be controlled (1, 11, 12, 13) at the reference time point, and characterised in that the acceptability evaluation unit is configured to: increase the degree of acceptance, when determining that both of the control content by the control unit and the operation content performed within the predetermined time period have an orientation of further energy conservation; and decrease the degree of acceptance, when determining that the operation content performed within the predetermined time period with respect to the control content by the control unit has an orientation of further non-energy-conservation. a storage unit configured to previously store a plurality of control contents for an apparatus to be controlled (1, 11, 12, 13), corresponding to a plurality of energy conservation levels that indicate degrees of energy conservation, respectively; a setting unit configured to set an energy conservation level; a control unit configured to refer to the storage unit, and then control the apparatus to be controlled (1, 11, 12, 13), based on a control content corresponding to the energy conservation level that has been set in the setting unit; a request acquisition unit configured to define, as a reference time point, a time point when the control unit starts to control the apparatus to be controlled (1, 11, 12, 13) based on the control content, the request acquisition unit being configured to acquire an operation content performed by a user for control of the apparatus to be controlled (1, 11, 12, 13) within a predetermined time period of at least one of before and after the reference time point; and an acceptability evaluation unit configured to evaluate, as a degree of acceptance, a degree of the user's acceptability to control performed by the control unit at the reference time point, based on the operation content that has been acquired by the request acquisition unit, wherein the setting unit is configured to, when the degree of acceptance is higher than a first threshold value, change the energy conservation level so that energy to be consumed in the apparatus to be controlled (1, 11, 12, 13) is made smaller than energy that has been consumed in the apparatus to be controlled (1, 11, 12, 13) at the reference time point, and characterised in that the acceptability evaluation unit is configured to: increase the degree of acceptance, when determining that both of the control content by the control unit and the operation content performed within the predetermined time period have an orientation of further energy conservation; and decrease the degree of acceptance, when determining that the operation content performed within the predetermined time period with respect to the control content by the control unit has an orientation of further non-energy-conservation. increase the degree of acceptance, when determining that both of the control content by the control unit and the operation content performed within the predetermined time period have an orientation of further energy conservation; and decrease the degree of acceptance, when determining that the operation content performed within the predetermined time period with respect to the control content by the control unit has an orientation of further non-energy-conservation.