At least one processor included in an information processing apparatus carries out: a division process of dividing input constraint conditions into a plurality of groups; a conversion process of converting the constraint conditions into a predetermined format; and an integration process of integrating the constraint conditions which are expressed in the predetermined format. In the conversion process, the processor carries out, in a parallel manner, a plurality of processes which respectively correspond to the plurality of groups, where each of the plurality of processes is constituted by conversion processes on respective constraint conditions belonging to one group. This makes it possible to support decision making of a user.