To detect a malignant tumor more accurately by detecting a feature of a cancerous tumor pulsation more appropriately, a tissue malignant tumor detection method according to the present invention includes: segmenting, into blocks, a region scanned with ultrasound (S100) estimating, based on a scan signal, a tissue pulsation that is a temporal variation in tissue displacement derived from pulsations of a tissue (S101) extracting, for each of the blocks, pulsation-related features that are parameters related to the tissue pulsation (S103) calculating distribution characteristics of the pulsation-related features for each of the blocks (S104) and classifying, based on the distribution characteristics, whether or not each of the blocks is a malignant block that is a block including the malignant tumor (S105).
