Provided is an application architecture design method in which an information processing device is used, the method including the steps of: inputting information about dependency relations and design aspects, which are design items regarding modules for running functions, virtual machines for running the modules, and physical machines for running the virtual machines; and executing processing of adapting architecture properly by switching the input information about the dependency relations and the design aspects in matrices in a DSM format, and thereby rearranging allocation of the modules, allocation of the virtual machines, and allocation of the physical machines in stages in the DSM format. As a result, an excellent design solution for architecture suitable for a virtualized environment, a cloud environment deriving, or a similar environment can be derived.