A communication method for implementing a real-time streaming using hypertext transfer protocol in a network is provided. The method includes the following steps. A communication assist apparatus according to the present invention comprises an apparatus for presenting a visual stimulus on a display screen and the like, and a processing apparatus for processing brain wave data from an electroencephalograph that measures a brain wave after stimulus presentation by the presenting apparatus. When the axial displacement exceeds the normal range, the output actuates an indicator in relation to the magnitude of the displacement in excess of the normal range. The apparatus has a control mechanism for varying the pressure in the crank chamber. The heater temperature is calculated based on the heater element resistance, and the heater resistance is adaptively adjusted to account for sensor-to-sensor variation.