In a trajectory information processing apparatus (201) for equalizing the sensitivity of input near a starting point of a trajectory input to the extent possible, regardless of direction of movement, the trajectory information processing apparatus (201) including an input receiving unit (202) receives input of coordinate information of a trajectory at a first definition, a correcting unit (203) corrects the coordinate information of the trajectory based on a pair of coordinates of a starting point of the trajectory at the first definition and a pair of coordinates of the starting point of the trajectory at a second definition lower than the first definition, a converting unit (204) converts the corrected trajectory coordinate information to the second definition and outputs the converted coordinate information, the correcting unit (203), if the starting point locates on an edge of an area which includes the starting point at the first definition, and includes pairs of coordinates which are to be converted to a same pair of coordinates at the second definition, then corrects the pairs of position coordinates of the trajectory so that the starting point of the trajectory is located further inside than said edge of the area.