Device to test mobile terminal and testing method thereof

A mobile terminal testing device (10) includes a reproduction unit (31) that reproduces a BB signal (110) to output at least one reproduced BB signal (110), an adder (34) that adds a BB signal (130) that are frequency-shifted and a reproduced BB signal (131) to output an added BB signal (140), an up-converter (12) that generates a multicarrier test signal (150) by making a frequency conversion of the added BB signal of an I phase and Q phase and outputs the multicarrier test signal (150) to UE, and an analyzer (40) that analyzes a response signal output by the UE in response to the multicarrier test signal (150) and the analyzer (40) includes a throughput calculation unit (41) that calculates throughput for the multicarrier test signal (150) and an RSRP acquisition unit (42) that acquires RSRP.