Character input prediction apparatus, character input prediction method, and character input system

A character input prediction apparatus includes: an operation input unit that obtains information of a character input operation by a user using a character key layout display which includes character keys; a dictionary storage unit that stores a dictionary including candidate character strings; an indication movement detection unit that detects an indication position and an indication direction respectively showing a position and a movement direction of the character input operation in the character key layout display, from the information of the character input operation; a filter generation unit that determines a character range located in the indication direction with the indication position as a base point, in the character key layout display; and a dictionary search unit that searches the dictionary for a predictive character string including any character included in the character range.