A gaging apparatus and method for automation of a shoemaking process are provided for automating a shoemaking process. According to the method, the gaging apparatus obtains operation data according to the gaging process of drawing a gaging line on a boundary between the upper and the sole for shoe manufacturing, and generates trajectory data for the boundary based on the operation data. Based on the trajectory data, the gaging apparatus generates robot trajectory data for performing a buffing and bonding process after the gaging process and transmits it to a shoemaking robot.