A work assistance system that assists a worker working in a factory equipped with a plurality of processing apparatuses includes: a display unit having portability and configured to display information provided to the worker, an imaging unit having portability and configured to capture an image of the processing apparatus; a display controller configured to control a content of information displayed on the display unit; and an identifying unit configured to identify from which direction the processing apparatus is captured by the imaging unit, based on data captured by the imaging unit. When the direction identified by the identifying unit is a predetermined direction, the display controller causes the display unit to display an adjustment screen for adjusting an operation parameter of the processing apparatus captured by the imaging unit.