How do we distinguish the thermal coefficient component is NTC or PTC that is one in a glass bead thermistor?

 

What are you trying to determine

A PTC resistor increases resistance as its temperature increases. An NTC decreases resistance as its temperature decreases.

To determine how much, read the datasheet. You can get a rough idea - a linear approximation - by measuring its resistance at room temperature while noting the room’s temp. Then, place in a container of boiling water while measuring its resistance. That gives you two datapoints which is sufficient to derive a linear equation.

 

If you're simply trying to detect whether the thermistor is NTC or PTC then just connect it to an Ohmmeter, hold the thermistor in your hand and note whether the measured resistance increases or decreases with hand warmth.