1. An ultrasonic diagnostic apparatus comprising: an ultrasonic wave transmitting/receiving means configured to transmit/receive ultrasonic waves into/from an object; a tomogram constructing means configured to generate a tomogram on a basis of RF signal frame from an inside of the object, which is received by the ultrasonic wave transmitting/receiving means; an elasticity information calculating means configured to calculate elasticity data of a biomedical tissue of the object by using the RF signal frame data; an elasticity image constructing means configured to generate an elasticity image on a basis of the elasticity data calculated by the elasticity information calculating means; a display means configured to display the tomogram and/or the elasticity image; an estimation data generating means configured to generate estimation data for estimating the characteristic of the biomedical tissue on the basis of the elasticity image; an estimation data selecting means configured to select at least one parameter used for the estimation of the characteristic of the biomedical tissue and to make the selected parameter displayed on the display means, an analyzing means configured to analyze the elasticity image using at least one parameter selected by the estimation data selecting means and to make the result of analysis displayed on the display means; wherein the display means displays the parameter used for the estimation of the characteristic and the result of analysis.