1. A routine executing method in a parallel database system, comprising the steps of: analyzing, by a definition statement analyzing unit of said database system, a definition statement of a routine related to database processing, to create a program of execution process instructions of said routine, store said execution process instructions in an information storage unit, decide whether or not said routine contains a database operation statement, and store a result of the decision thus made in said information storage unit as check information; analyzing, by a query statement analyzing unit of said database system, a query statement related to database processing, to create a first program of execution process instructions of said query to be executed on a front end side of said database system and a second program of execution process instructions of said query to be executed on a divided data side of said database system; and executing said routine by a routine execution unit on said divided data side based on said check information, when there is a call of said routine in said second program and a database operation statement is not contained in said routine.