Techniques for measuring the emotional state of minds in a person based upon a set of biological data captured from the person in a natural environment, where the person is not restricted at all. Various signals from sensors are captured with or without the intervention of the person. These signals are processed to be converted to sensor data. A dedicated computing device working as a server is provided to collect the sensor data along with other necessary data available on the Internet, where the measurement of the emotion is measured, derived or calculated based on the sensor data, the fetched necessary data and/or the historical measurements.
