这两个句子的意思基本没有差别。There be句型中there是形式主语。be是不及物动词，后面的名词是真正的主语。比较下面的句子。

1) It is said that Tom will come tomorrow.

2) Tom is said to come tomorrow.

1) It is said that there will be an election this week.

2) There is said to be an elecction this week. 

可以看出，1）句中的that从句的主语作2）句中的主语，1）句that从句的will do在2）句中改为不定式。1）句是个主从复合句，2）句是个简单句。1）句的主题（topic）是tom明天回来这件事；2）句的主题（topic）是Tom这个人。这就是两个句型的细微差别。通常人们会忽略这个细微差别。将两个句子等同看待。

It is said that there will be an election this week.

=There is said to be an election this week.

这2个句子有何区别？

解答如下：

以上句子结构实际上是以下2种结构变体

A:主动形式

(1)People say that sb do sth

=It is said that sb do sth

=sb is said to do sth

B:被动形式

(2) People say that sb/sth be done

=It is said that sth be done.

=sth is said to be done

It is said that he has gone to Beijing.   

=He is said to have gone to Beijing.
据说他已经到北京去了。

It is said that they cancelled the order for 300 trucks. =They is said to cancell the order for 300 trucks.
据说他们撤销了300台卡车的订货。

It was said that he was a very good doctor.   

=He was said to be a very good doctor.
据说他医术高明。