To provide an apparatus for making embroidery data, enabling high- quality Tatami sewing [sewing a pattern like that of Tatami mat (rush mat in Japanese life)].

An input figure to be embroidered is read, the read input figure is horizontally swept and the figure is decomposed into subsidiary parts (step S1). A graph showing the connection relationship between decomposed parts is formed and a wood structure comprising the subsidiary parts as knots is made (step S2). The Tatami sewing data of the subsidiary data corresponding to each knot are successively outputted and the knots of the outputted subsidiary parts are removed from the wood structure and digested (step S3). Since the relationship between the subsidiary parts not finishing Tatami sewing yet and those having finished Tatami sewing is clear, sewing under move can be carried cut. Consequently, since the moving sewing will not appear on the surface, high-quality embroidery can be performed.