A synchronization method for a multi-SIM multi-standby communication terminal, comprising: a first card of the communication terminal camping on a first cell; characterized by the synchronization method further comprising: determining whether a second card of the communication terminal belongs to a same operator as the first card; if the second card of the communication terminal does not belong to the same operator as the first card, determining whether the network number of the first cell is contained in and Equivalent Home Public Land Mobile Network EHPLMN, or in a Equivalent Public Land Mobile Network EPLMN list of the second card, or whether the network number of the first cell is in a Registered Public Land Mobile Network RPLMN of the second card; if the second card of the communication terminal belongs to the same operator as the first card, or if the network number of the first cell is contained in the EHPLMN or EPLMN list of the second card, or if the network number of the first cell is RPLMN of the second card, controlling the second card to camp on the first cell with the first card; if the network number of the first cell is not contained in the EHPLMN or EPLMN list of the second card, or if the network number of the first cell is not RPLMN of the second card, controlling the second card to camp on a second cell; determining whether or not the second card succeeds in camping on the second cell; if the second card succeeds in camping on the second cell, determining whether or not the second card succeeds in registering with the second cell; and if the second card fails to camp on the second cell, or if the second card fails to register with the second cell, controlling the second card to camp on the first cell with the first card. a first card of the communication terminal camping on a first cell; characterized by the synchronization method further comprising: determining whether a second card of the communication terminal belongs to a same operator as the first card; if the second card of the communication terminal does not belong to the same operator as the first card, determining whether the network number of the first cell is contained in and Equivalent Home Public Land Mobile Network EHPLMN, or in a Equivalent Public Land Mobile Network EPLMN list of the second card, or whether the network number of the first cell is in a Registered Public Land Mobile Network RPLMN of the second card; if the second card of the communication terminal belongs to the same operator as the first card, or if the network number of the first cell is contained in the EHPLMN or EPLMN list of the second card, or if the network number of the first cell is RPLMN of the second card, controlling the second card to camp on the first cell with the first card; if the network number of the first cell is not contained in the EHPLMN or EPLMN list of the second card, or if the network number of the first cell is not RPLMN of the second card, controlling the second card to camp on a second cell; determining whether or not the second card succeeds in camping on the second cell; if the second card succeeds in camping on the second cell, determining whether or not the second card succeeds in registering with the second cell; and if the second card fails to camp on the second cell, or if the second card fails to register with the second cell, controlling the second card to camp on the first cell with the first card. determining whether a second card of the communication terminal belongs to a same operator as the first card; if the second card of the communication terminal does not belong to the same operator as the first card, determining whether the network number of the first cell is contained in and Equivalent Home Public Land Mobile Network EHPLMN, or in a Equivalent Public Land Mobile Network EPLMN list of the second card, or whether the network number of the first cell is in a Registered Public Land Mobile Network RPLMN of the second card; if the second card of the communication terminal belongs to the same operator as the first card, or if the network number of the first cell is contained in the EHPLMN or EPLMN list of the second card, or if the network number of the first cell is RPLMN of the second card, controlling the second card to camp on the first cell with the first card; if the network number of the first cell is not contained in the EHPLMN or EPLMN list of the second card, or if the network number of the first cell is not RPLMN of the second card, controlling the second card to camp on a second cell; determining whether or not the second card succeeds in camping on the second cell; if the second card succeeds in camping on the second cell, determining whether or not the second card succeeds in registering with the second cell; and if the second card fails to camp on the second cell, or if the second card fails to register with the second cell, controlling the second card to camp on the first cell with the first card.