A subject information obtaining apparatus includes: a plurality of conversion elements configured to receive an elastic wave and convert the elastic wave into a plurality of received signals, a storage unit configured to store a plurality of reference signals corresponding to shapes of the object inside a subject, and an FDI adaptive processing unit configured to execute the FDI method and the adaptive signal processing using the plurality of received signals and two or more reference signals among the plurality of reference signals, in order to obtain two or more power intensity distributions for the two or more reference signals.