Provided is a nonvolatile resistor network assembly characterized by that: it comprises a first and a second resistor network which are each composed of a plurality of nonvolatile resistive elements connected together; it also comprises a write means for writing into the first and second resistor networks; and writing into the first and second resistor networks is performed by the use of the write means in a manner to make total resistances of respectively the first and second resistor networks different from each other. Further provided is a nonvolatile logic gate which performs logical operation using stored data determined by the total resistances of the respective nonvolatile resistor networks.