It was solved
I installed another Pixcelpost to use another DB for my diary. And also I used addon of "Multiphoto" for new Pixcelpost, because my diary should be shown more than one entries in one page. And when I make post for diary, I just use fake photo to upload, because it can not allow to upload the post without photo. Therefore, in order that hiding the fake picture in multiphoto page as diary, deleted several lines in multi_template.html (/blog/addons/_multiphoto/multiphoto)
Then I changed all link of new Pixcelpost, in order to connect with old Pixcelpost. And add one new link in old Pixcelpost to connect diary page in new Pixcelpost.
Now I can make both of post for diary blog and for normal photo blog in same template by separated DB.