1. A movement analysis apparatus comprising: a data acquiring unit that acquires moving image data including a series of image data obtained by photographing an environment that includes a human body; a storing unit that stores target range designating information that designates a moving range of a predetermined part of the human body, wherein the moving range is a partial area of the moving image data; a detecting unit that designates, for each piece of still image data included in the obtained moving image data, a plurality of image areas designated by the moving range of the predetermined part of the human body, and detects, only from the plurality of designated image areas, an image area including the predetermined part of the human body for the each piece of still image data included in the obtained moving image data; a recording unit that records results of the detection performed by the detecting unit; a providing unit that provides at least one of the results of the detection recorded in the recording unit for a plurality of sets of moving image data; a computation section that calculates a time during which the predetermined part of the human body stays in the image area in which the predetermined part of the human body was detected and calculates a difference between the calculated time and a time which was calculated in past; and an output unit that outputs the calculated difference.