An air conditioner control system (100, 200, 400), comprising: one or more air conditioners (101_1, 101_2, 101_3, 101_4, 101_5) configured to condition an environment in a target space; an integrated controller (102, 402) configured to communicate with the one or more air conditioners (101_1, 101_2, 101_3, 101_4, 101_5); a relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2) configured to communicate with the integrated controller (102, 402); and a plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) each comprising a battery supplying power for operation and configured to wirelessly communicate with the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2), wherein the integrated controller (102, 402) comprises air conditioner control means for controlling the one or more air conditioners (101_1, 101_2, 101_3, 101_4, 101_5) based on control parameter data, each of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) comprises: measuring means for measuring an environment value of the target space and sending measurement data including the measured environment value to the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2); and sleep control means for effecting, according to a sleep time decided by the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2), a sleep mode in which power consumption is lower than in a normal mode, and the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2) comprises: control parameter creation means (128, 228) for creating the control parameter data based on the measurement data received from each of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5); and sleep time deciding means (133, 333) for deciding, according to remaining charge amounts of the batteries, the sleep time so that at least two sensor devices of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) run out of battery charge around the same time. one or more air conditioners (101_1, 101_2, 101_3, 101_4, 101_5) configured to condition an environment in a target space; an integrated controller (102, 402) configured to communicate with the one or more air conditioners (101_1, 101_2, 101_3, 101_4, 101_5); a relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2) configured to communicate with the integrated controller (102, 402); and a plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) each comprising a battery supplying power for operation and configured to wirelessly communicate with the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2), wherein the integrated controller (102, 402) comprises air conditioner control means for controlling the one or more air conditioners (101_1, 101_2, 101_3, 101_4, 101_5) based on control parameter data, each of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) comprises: measuring means for measuring an environment value of the target space and sending measurement data including the measured environment value to the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2); and sleep control means for effecting, according to a sleep time decided by the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2), a sleep mode in which power consumption is lower than in a normal mode, and measuring means for measuring an environment value of the target space and sending measurement data including the measured environment value to the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2); and sleep control means for effecting, according to a sleep time decided by the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2), a sleep mode in which power consumption is lower than in a normal mode, and the relay device (103_1, 103_2; 203_1, 203_2; 303_1, 303_2) comprises: control parameter creation means (128, 228) for creating the control parameter data based on the measurement data received from each of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5); and sleep time deciding means (133, 333) for deciding, according to remaining charge amounts of the batteries, the sleep time so that at least two sensor devices of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) run out of battery charge around the same time. control parameter creation means (128, 228) for creating the control parameter data based on the measurement data received from each of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5); and sleep time deciding means (133, 333) for deciding, according to remaining charge amounts of the batteries, the sleep time so that at least two sensor devices of the plurality of sensor devices (104_1, 104_2, 104_3, 104_4, 104_5) run out of battery charge around the same time.