Can I use GPS Module ET314AC with Arduino Mega? Here is the datasheet of ET314AC ET314AC Datasheet
yes you can, the datasheet is saying that you can read from a serial port which is what you want to do.
Connecting the serial port to TX and RX pins of the Arduino, ground and power, you should be able to talk to the module.
I cant find a breakboard for this module so I suppose you are going to solder it or you can give us the link where you bought it.
I suggest you to try with TinyGPS library to decode the data, after you are sure that the module is talking to the Arduino correctly.