Information output device and information output method

An information output device comprising:

• an image display unit that displays an image;
• a user input reception unit that receives an input from a user;
• a sensor data input reception unit that receives an input of sensor data of a vehicle;
• and
• a display control unit that switches between a first parameter transition image screen and a second parameter transition image screen in accordance with the input of the user received by the user input reception unit and displays the screens on the image display unit, the first parameter transition image screen including a first parameter transition image indicating time-series transitions of first parameters of a plurality of types based on the sensor data of the vehicle which is received by the sensor data input reception unit before a first point in time, and the second parameter transition image screen including a second parameter transition image indicating time-series transitions of second parameters of a plurality of types corresponding to at least some of the first parameters of a plurality of types before the first point in time,
• wherein in a case where a second point in time before the first point in time or a designated period is received by the user input reception unit on the first parameter transition image screen, the display control unit is configured to cause a first period display image element indicating the second point in time or the designated period on the first parameter transition image screen to be displayed on the image display unit and cause a second period display image element indicating the second point in time or the designated period on the second parameter transition image screen after switching from the first parameter transition image screen to be displayed on the image display unit.