A resource allocation apparatus selects, based on process information indicating a plurality of functions to be used in performing a process and performance requirements for communications between the plurality of functions, the plurality of functions one by one as a first function in order of the performance requirements, the process being performed by a computing system including a plurality of devices, each of the plurality of devices being bus-connected to one or more other devices. The resource allocation apparatus then determines a first device that is used to implement the first function, based on distances of bus-based communication paths between each of devices that are able to implement the first function and a second device that is used to implement a second function that is a communication partner of the first function.