An X-ray diagnostic system has a display unit, a selection unit, a calculation unit and an imaging execution unit. The display unit displays images of a plurality of frames collected by a predetermined frame rate about an object. The selection unit selects an image of a particular frame from the images of the frames displayed on the display unit. The calculation unit calculates a delay time to the particular frame selected by the selection unit based on the frame rate. The imaging execution unit executes an imaging based on the delay time calculated by the calculation unit.