户口本复印件？“户口本”是只有中国才有的事物（请参考老罗语录），所以办签证应该不需要什么户口本吧。护照肯定需要的，他在新西兰可以证明身份的IC也会有用吧
请看这里：
http://app.ica.gov.sg/serv_visitor/entry_visa/visa_level1.asp
这个link里，B款下的最后一条：
(B) Social Visit (visiting friends, relatives and for tourism)
Submission at ICA
Local contact's Singapore identity card (original & photocopy);
1 copy (original) of duly completed and signed Form V39A ;
A letter from the applicant’s employer granting leave of absence and stating how long the applicant has been employed, his/her designation and salary if he/she is employed; or
A copy of the household booklet if he/she is a PRC national and is unemployed.
这个link里，B款下的最后一条：
(B) Social Visit (visiting friends, relatives and for tourism)
Submission at ICA
Local contact's Singapore identity card (original & photocopy);
1 copy (original) of duly completed and signed Form V39A ;
A letter from the applicant’s employer granting leave of absence and stating how long the applicant has been employed, his/her designation and salary if he/she is employed; or
A copy of the household booklet if he/she is a PRC national and is unemployed.
Huasing Association 1999 - 2013