The present invention provides an apparatus and method which contains a particular date preset by a user and several groups of particular information, each group relating to a pre-specified date difference between the preset date and current date, and automatically displays a group of information corresponding to current date difference. The apparatus according to the present invention comprises a nonvolatile memory for storing information corresponding to date differences, a timing unit for tracking current time and date, a control unit for calculating the date difference between the preset date and current date and reading out information depending upon the date difference from the memory, a ROM storing an execution program, a font ROM storing display fonts, a LCD control unit, a LCD panel, an audio signal generation unit, and a beeper.