A physiological information system includes: a plurality of physiological information sensors configured to acquire physiological information data of a subject being tested, and a physiological information processing apparatus communicatively connected to each of the plurality of physiological information sensors. The physiological information processing apparatus is configured to transmit a synchronous packet toward each of the plurality of physiological information sensors. Each of the plurality of physiological information sensors is configured to: acquire the physiological information data of the subject being tested； receive the synchronous packet transmitted from the physiological information processing apparatus or a trigger signal associated with the synchronous packet； start AD conversion processing for the acquired physiological information data when receiving the synchronous packet or the trigger signal； and transmit the physiological information data converted into digital data to the physiological information processing apparatus.
