The invention relates to a device and method for measuring atmospheric pressure and processing atmospheric-pressure information. The invention is based on the idea that the atmospheric pressure is measured at several moments in time, the atmospheric-pressure data is stored in a memory and, and the measured atmospheric-pressure data is displayed on a display unit with the aid of special atmospheric-pressure indicators (12) using a graph, one axis of which corresponds to time and the other axis to atmospheric pressure. In addition, a reference indicator (14), which comprises at least one sloping line, is arranged on the display unit. According to the invention, the atmospheric-pressure indicators are scaled in such a way that a temporal change in atmospheric pressure of the magnitude of a specific predefined constant causes the consecutive atmospheric-pressure indicators (12) to be set in the graph parallel to the said sloping line.