1. A debugging aid device that provides aid in debugging when a plurality of iterations are executed in parallel, each being made up of a succession of instructions which are obtained by a compiler translating a plurality of source codes, the debugging aid device comprising: a list displaying unit operable to display the plurality of source lists in correspondence with each of the plurality of iterations; a specifying unit operable to specify, according to an input from a user, a source code within a first source list as a starting or an ending location of the execution; and a code displaying unit operable to display which source code within a second source list corresponds to the starting or the ending location of the execution.