A data processing apparatus has a processing memory section that stores plural processing sections for building a combination processing section; a construction data memory section that stores construction data for building the same combination processing section as the latest combination processing section used for executing a series of processing of most recently input data; and a processing construction section that reads, at a timing before data to be processed is input, plural processing sections forming the same combination processing section as the latest combination processing section, based on the construction data and connects the processing sections in the same order of processing as in the latest combination processing section, thereby building the same combination processing section as the latest combination processing section.