Abstract: In a mood analysis method using an electrocardiogram of a user, RR intervals in the electrocardiogram are computed, and low-frequency (LF) values and high-frequency (HF) values are also computed according to the RR intervals. Standard values of sympathetic nervous system (SNS) activity and parasympathetic nervous system (PSNS) activity are acquired corresponding to age and sex data of the user, to establish a mood display coordinate system. Coordinates of the LF values and the HF values in the mood display coordinate system are computed to determine a mood of the user.

Abstract: In a breathing analysis method using an electrocardiogram of a user, a breathing curve is generated according to R waves in the electrocardiogram, and whether the user is currently taking a breathing out action or a breathing in action is detected according to the breathing curve. A duration of the breathing in action or the breathing out action of the user is computed according to the breathing curve, and a ratio of the duration and a standard time of the breathing in action or the breathing out action is computed. A breathing in or out progress is displayed in a progress demonstration bar on the display device according to the ratio.