Brain stimulation device and brain stimulation system

A brain stimulation device comprising:

• a display;
• a biometric information acquisition unit;
• an accommodation space configured to accommodate an article;
• an output unit having at least one area configured to be attached to a body of a user and apply a current corresponding to the article to the body of the user to apply brain stimulation to the user such that the user feels a smoking sensation;
• and
• a processor configured to control operations of the display, the biometric information acquisition unit, and the output unit,
• wherein the biometric information acquisition unit detects biometric information of the user that changes in response to the brain stimulation, and
• the processor controls the display to display one of a virtual reality image and an augmented reality image including the detected biometric information of the user.