An indoor environment control system (4090) comprises a storage unit (4016), a detection unit (4083), an indoor environment control device (4062), an output unit (4065), and an input unit (4064). The storage unit stores a set value of an indoor environment. The detection unit is configured to detect a state value of the indoor environment. The indoor environment control device is configured to adjust the indoor environment in accordance with the set value. The output unit is configured to output a message for asking a user whether to accept the state value if the state value detected by the detection unit reaches the set value. The input unit is configured to obtain an answer of the user to the message.