1. A data storing method of a nonvolatile storage device that comprises a plurality of nonvolatile memory devices electrically connected to a plurality of channels, the data storing method comprising: allocating part of write data provided from a host to the nonvolatile memory devices to each channel; determining whether at least one channel among the channels is present that is connected to a nonvolatile memory device in a last page offset state; and when the at least one channel is determined to be present; scheduling erase commands for a next block of the nonvolatile memory device to be performed across the plurality of channels; scheduling write commands to be performed across the plurality of channels with respect to the allocated write data; and executing the erase commands and the write commands across the plurality of channels.