A diagnostic imaging apparatus including: an imaging section imaging a site of an examinee to generate image data a biological signal acquisition section acquiring signal data which is periodical movement of the site of the examinee a storage section storing the generated image and acquired biological signal data a biological signal analysis section analyzing the signal data to detect signal waveforms and a control section calculating evaluation values indicating steadiness of the periodical movement among the respective periods, causing the biological signal analysis section to perform extraction from among the plurality of successive periods on the basis of the calculated evaluation values and a time difference or time ratio threshold range, reading out image data generated during an extracted adaptive period, among the image data stored in the storage section, from the storage section, and causing a display section to display the read-out image data.
