To facilitate time zone setting with a simple key operation by displaying more time zone specification information even in a device where the size of display is restricted, and the number of displayable characters is restricted.

This time zone setting method for setting one time zone as the base of time setting in information terminal equipment 1 having a display screen includes: a step for displaying a list configured of time zone specification information for specifying a time zone for each time zone, and for selecting any time zone specification information from the list; and a setting step for defining the time zone to be specified by the selected time zone specification information as one time zone.