A controlling method executes an auto-calculation procedure of a controlling system when a person is detected indoor. The auto-calculation procedure firstly collects current environment parameters via sensors for calculating a current comfort-index based on the sensed environment parameters. Secondly, it calculates a target temperature/humidity adjustment value for the environment to reach a best comfort-index based on the current comfort-index. Then, it controls indoor apparatuses based on the calculated target temperature/humidity adjustment value to adjust the environment to be in the best comfort-index. The controlling system can execute a learning procedure, it records the current environment parameters and a user-feedback to build a learning model. Therefore, it helps the environment to satisfy user demands quickly by using the learning model directly when the indoor environment has the environment parameters same as the learning model.