A semiconductor memory device includes a first nonvolatile memory, a second nonvolatile memory, a controller and an input/output bus. The first nonvolatile memory includes a plurality of memory cells having a first memory cell configuration. The second nonvolatile memory includes a plurality of memory cells having a second memory cell configuration different from the first memory cell configuration. The controller includes a first controller which controls the first nonvolatile memory, and a second controller which controls the second nonvolatile memory. An input/output bus is connected to the controller and is configured to exchange signals between an external apparatus and the controller. In accordance with a signal input via the input/output bus, the controller performs at least one of an operation of accessing the first nonvolatile memory by the first controller, and an operation of accessing the second nonvolatile memory by the second controller.