A detecting apparatus and a detecting method for physiological information are provided. The detecting apparatus includes a first optical signal provider configured to provide an organism with a first optical signal, a signal receiver configured to receive the first physiological signal, and a processor. The first optical signal, after interacting with the organism, turns into a first physiological signal. The processor is configured to calculate a plurality of physiological information values of the organism according to the first physiological signal determine whether or not any of the physiological information values is abnormal and replace the abnormal physiological information value with a physiological information reliable value when there is the abnormal physiological information value.
