Disclosed is a technology of generating an instruction set architecture (hereinafter, referred to as ISA) and a series of logic circuit configuration information of a processor for executing an application program from an application pro gram described in a high-level language. The present inven tion also relates to a custom LSI development platform technology which can design, develop, and manufacture the application specific custom LSI in a short time by applying the generated ISA and logic circuit configuration informa tion to a dynamic logic circuit reconfigurable processor. Furthermore, disclosed is a dynamically reconfigurable pro cessor, which is reconfigurable using the generated logic circuit configuration information. Associated methods are also disclosed.