To provide an information input system capable of performing an input with a simple method by unifying words and expressions frequently used, and precisely using them according to an input position.

This information input system comprises a terminal device and a server connected to each other in a communicable state through a network. An information input screen in the terminal device has a candidate value screen display means for automatically displaying a screen for displaying a candidate value group in the input area of an item in which classification information of a plurality of ranks and a plurality of candidate value groups for every combination of classification information are registered; a candidate value display means for refining the candidate value group of the item based on the classification information and displaying the result on a candidate value screen; a candidate value selection means for selecting one candidate value from the candidate value group displayed on the candidate value screen; and a candidate value copying means for copying the selected candidate value as the value of the information input area of the information input screen.