Access - compare two tables and update or insert data in first table

Question

Table 1:

PersNum       Name    Surname
    2321    Lenora  Springer
    2320    Donya   Gugino
    3326    Leland  Wittmer
    4588    Elmer   Mcdill

Table 2:

PersNum       Name    Surname
    2321    Lenora  Farney
    2320    Donya   Willimas
    3326    Leland  Wittmer
    4588    Maya    Mcdill
    7785    Yolanda Southall
    1477    Hailey  Pinner

 

I need to find a way to check the personal number (field "PersNum"), and then if PersNum exists, update Name and Surname in Table1. If PersNum doesn't exist, insert new row in Table1.

 

Thanks in Advance!