PROBLEM TO BE SOLVED: To solve the problem that large processing scale is required when adaptive signal processing is used to acquire higher spatial resolution.SOLUTION: An apparatus for acquiring subject information includes: a probe having a plurality of elements arranged to receive elastic waves propagating within a subject and convert the received elastic waves to received signals a first signal processing unit using the received signals output by the elements to calculate first output signals corresponding to the elastic waves from a target position a second signal processing unit using the first output signals of the target position to calculate second output signals corresponding to elastic waves from the target position and an image processing unit using the second output signals to generate image data to be displayed. At least one of the first signal processing unit and the second signal processing unit uses adaptive signal processing to calculate the first output signals or the second output signals.COPYRIGHT: (C)2012,JPO&INPIT