We use Gantt project at the office, on windows computer. We want to know if that possible to visualise gantt project on my IPhone or Ipad?
If you only need a read-only image which you can look at on iPad, you can export it to PNG from the desktop computer.
You may also try using GanttProject Cloud which automatically produces Gantt chart images from the uploaded projects. I am not sure if it works acceptably on mobile devices though. This service is in Beta.