1. An operation support apparatus performing processing using a computer for giving guidance leading to the start of tasks to a worker carrying out an operation in which execution timings for respective tasks are determined in advance, the apparatus comprising: a proficiency storage unit of a computer memory storing, for each worker, proficiencies with respect to tasks performed in the operation and determined corresponding to a difference between an output time of guidance related to a task and a task record time for the task; a guidance output unit of a computer processor obtaining a proficiency of a worker with respect to a task to be performed from the proficiency storage unit, correcting corresponding to the proficiency of the worker a guidance base time determined based on an operation schedule and determining a guidance control time corresponding to the proficiency of the worker, and instructing an output device to output the guidance to the worker at the guidance control time; a task record collecting unit of a computer processor creating task record information containing a task content and a task time of a task performed by the worker; and a proficiency determining unit of a computer processor correcting the proficiency of the worker with respect to the task based on the guidance control time of the guidance and the task time contained in the task record information, and updating the proficiency of the worker with respect to the task stored in the proficiency storage unit, wherein the guidance output unit obtains a latest proficiency from the proficiency storage unit when the proficiency of the worker with respect to the task to be performed is updated by the proficiency determining unit.