According to one embodiment, a nonvolatile memory device includes a word line interconnect layer, a bit line interconnect layer, and a pillar. In the electric potential measuring apparatus, a region with a dielectric constant less than a dielectric constant of the substrate is formed in the substrate to achieve an increase in resistivity of a portion of the substrate between detecting electrodes, or a decrease in a stray capacity between the detecting electrode and the substrate. One or more frequencies, for initial acquisition of signals from a transmitter, are selected based on the first and second parameters corresponding to the measured operating temperature. A tool andor material may be delivered to the tissue drawn into the tissue-receiving space. The window manager registers the button in response to the request and displays the button together with the icon.