1. A simulation support method comprising: generating an operation interface used to convert a subject model that is a block diagram model representing a subject system to be simulated, to a model for parallel computation, in which a plurality of subsystem models are connected to each other, wherein the plurality of subsystem models correspond to a plurality of processes in one step, and the processes repeatedly run in parallel in a cluster computer; inserting dummy blocks in the subject model, when an instruction for converting the subject model to the model for parallel computation is provided through the operation interface, wherein the dummy blocks are used to synchronize the data in the processes, which are transmitted between the processes that run in parallel; and editing a simulation program for parallel computation, based on the model for parallel computation that is the subject model in which at least the dummy blocks are inserted, wherein the simulation program for parallel computation is used to generate the processes that run in parallel in the cluster computer.