Library of javascripts for drawing network diagrams

I just posted it on Yahoo! Chiebukuro and Qiita, but I think I can hear more about it, so I posted it again.

What is the best library to draw a network diagram like the one below?

I am thinking of JavaScript as the language.I would appreciate it if you could let me know if there is a language or library that I can write more easily than that.
The goal is to visualize log data.

The log data is from the history of people moving from one facility to another.

The data is about the relationship between the two points as follows:
The following data groups are available:

·Starting point
·Arrival point
·Departure time

There are about 200,000 such data.

Based on this data, the nodes in the network diagram represent the facility and the edges represent the movement of people. I'd like to animate the movement of people (time elapsed based on departure time).

Also, I would like to visualize the number of people who passed between the two points (including duplication).(Thickness, color, etc. of the arrow on the edge.)

If you want JavaScript to run, you can run it on your browser, so you don't need to turn it into a video file.

I was going to use vis.js and SetTimeout together, but I thought it would be too difficult, so I asked you a question.

I look forward to hearing from you.