Dear @JaeWon.Kim,
First of all, you need to know that for the annual DGP simulation, DaySim is used as the calculation engine, while for the Point In Time analysis (Image-Based), Radiance and EvalGlare are used.
As specified by @EspenHansen, the annual simulation through Daysim is a simplified procedure and I can assure you that if you compare it with an image-based PIT analysis, you will have 2 very different results.
Some standards, such as the European one, accept the simplified method, but if in the same project you also have to illustrate a Fish-Eye image with the PIT results, it will be difficult to make the client understand why there is all that glare difference for a given month / day / time.
The solution would be to generate a PIT analysis for a whole year (using per example the colibri component) and extrapolate ONLY the glare value, through Evalglare, so to generate an annual chart, without to generate the 7860 images, which would be very time-expensive (based on the radiance parameters) and it would also take up a lot of memory. But here the Maestro is @mikkel. Maybe he has a better solution.
I hope I have helped you