1. An application architecture design method, comprising the steps of: inputting information about dependency relations and design aspects as input information, which are design items regarding modules for running functions that form an application program, 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 in design matrices in a Dependency (Design) Structure Matrix (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, to thereby output a design solution for architecture; the method further comprising: a dependency relation inputting step of inputting functions that constitute an application program operating in a distributed manner on a plurality of virtual machines, and information that indicates dependency relations between the functions; a design aspect inputting step of inputting setting requirements for providing an application and information that indicates specifics of the requirements; a design aspect storing step of receiving and storing the input information about the dependency relations and design aspects, and storing design matrix information, which is generated after rearrangement is finished for each; a function module design matrix displaying step of displaying, in a DSM format, a function-module design matrix, which reflects an association relation between a function allocated to a module and the module to which the function is allocated, as design matrix information where the information about the dependency relations and the information about the design aspects are input items, and receiving an input of rearrangement of the function-module design matrix to output the design matrix information on which processing of reflecting the rearrangement has been performed; a module arrangement design matrix displaying step of displaying, in a DSM format, a module arrangement design matrix, which has the design matrix information as an input and indicates, for each module, a virtual machine where the each module operates, and receiving an input of rearrangement of the module arrangement design matrix to output the design matrix information on which processing of reflecting the rearrangement has been performed; and a resource allocation design matrix displaying step of displaying, in a DSM format, a resource allocation design matrix, which has the design matrix information as an input and indicates, for each virtual machine, a physical machine where the each virtual machine is allocated and run, and receiving an input of rearrangement of the resource allocation design matrix to output the design matrix information on which processing of reflecting the rearrangement has been performed, wherein the design information storing step comprises: using function module design matrix information, which is generated after the function module design matrix displaying step is finished, as input information for displaying the module arrangement design matrix; using module arrangement design matrix information, which is generated after the module arrangement design matrix displaying step is finished, as input information for displaying the resource allocation design matrix; and linking the function-module design matrix, the module arrangement design matrix, and the resource allocation design matrix in stages.