An electronic blood pressure monitor, a data processing device and a data processing method are provided. The electronic blood pressure monitor (1) comprises a blood pressure measuring portion, a memory portion (7), an operation portion (5), a determination portion (18), a calculation portion (14) which includes a blood pressure average value calculation unit (20), and a display portion (6). The operation portion (5) comprises a group of condition input units (15) which are used for setting up calculation conditions of the blood pressure average value. Every condition input unit of the group of condition input units (15) consists of a parameter type display region (16) and an input region (17). The memory portion (7) is used for storing the blood pressure measurement data and the set parameter. The determination portion (18) synthetically determines whether the blood pressure measurement data stored in the memory portion (7) corresponds with the set calculation conditions of the blood pressure average value or not, and takes the blood pressure data corresponding with the conditions as the certain data. The blood pressure average value calculation unit (20) calculates the blood pressure average value based on the certain data. The electronic blood pressure monitor (1) can enable the user to have more condition settings and condition combinations of the blood pressure average value calculation as desired, and has advantages that the program is simple, the operation interface is clear and the structure is simple.Linvention concerne un moniteur de pression artérielle électronique, un dispositif de traitement de données et un procédé de traitement de données. Le moniteur de pression artérielle électronique (1) comprend un module de mesure de la pression artérielle, un module mémoire (7), un module de traitement (5), un module de détermination (18), un module de calcul (14) comprenant une unité de calcul de la valeur moyenne de la pression artérielle (20), et un module af
