Storage the form in two tables on the database

Hello,

For my forum module, I want to create a subject with a form, but with my database, I have to register form data in two tables.

tl_forum_topic -> id,tstamp,titre,alias,dateSujet,sujetCloture,sujet Resolu,published,featured
tl_forum_message -> id, tstamp, pid, author,dateMessage,content,published

I have to register the title, generate the alias, and the date of the topic in tl_forum_topic
And register the author, the dateMessage and the content in tl_forum_message

I have to use a Hook or I can do this in another way ?

Thanks for your answers.

Anybody ? :o