1. A usability evaluation support apparatus for supporting evaluation of usability of an instrument comprising a display unit for displaying information relative to a given task, the apparatus comprising: means for acquiring an operation log information which is related to an operation performed by a user and which includes at least one item of operation log data measured during performance of the task; index evaluation means for generating at least one effectiveness index, efficiency index, and satisfaction index related to achieving a target of the task, wherein the index evaluation means evaluates and generates the effectiveness, efficiency, and satisfaction indexes by a statistical calculation using at least one data item included in at least one of a plurality of measurement items including the operation log information.